Select Count

Similar Questions

• What is the difference between count (1) selection of the tab and select count (*) tab;

  What is the difference between count (1) selection of the tab and select count (*) tab;

  994122 wrote:

  Hello

  SQL > set timing on

  SQL > select count (*) of the emp

  2 where deptno = 30;

  COUNT (*)

  ---------------

  6

  Elapsed time: 00:00:00.01

  SQL > select count (1) of the emp

  2 * where deptno = 30

  SQL > /.

  COUNT (1)

  -------------

  6

  Elapsed time: 00:00:00.01

  See that both give the same time

  Do you really think the 100th's of a second it takes 6 rows from counting will truly representative of the difference it takes actually?

  Such a small data set cannot possibly show no difference to these larger units of time (in the calculation of terms where we have millions of instructions per second in lieu)

  As the link to the FAQ provided in the response of Anton (first response on this thread) Watch, count (1) and count (*) are essentially the same, except that count (1) actually get re-written by the query re - write the step of the optimization to make it count (*).

  Generally 'count (*)' makes more sense language, because it reads like "count" while "count (1)" reads as "count we ', which does not have as much good sense when you actually count all.

• Get the select count (*) including zero '0 '.

  Hi gurus,
  
  I have the problem here, I have this request:
  
  SELECT COUNT (t.column1) AS mycount.
  To_char(t.CREATION_DATE,'MONTH') AS themonth
  Table 1 t
  WHERE the t.creation_date BETWEEN TO_DATE('01/01/2011') AND TO_DATE('09/07/2011') AND t.column1 > 0
  GROUP OF TO_CHAR (t.creation_date, 'MONTH')
  ORDER BY TO_DATE (TO_CHAR (t.creation_date, 'MONTH'), 'MONTH')
  
  then I get this query result
  
  
  MYCOUNT. THEMONTH
  -------------- ----------------
  JANUARY | 3
  MARCH | 6
  APRIL | 5
  CAN | 9
  JULY | 2
  
  
  and I need like this
  MYCOUNT. THEMONTH
  -------------- ----------------
  JANUARY | 3
  FEBRUARY | 0
  MARCH | 6
  APRIL | 5
  CAN | 9
  JUNE | 0
  JULY | 2
  
  what I am doing wrong? or what I can add to the code? Please, I hope you can help with this one.
  
  
  Best regards
  Mentor

  Mentor wrote:

  Hey and when I don't have a date range and did well id how can I get the result?

  SELECT  NVL(COUNT(column1),0) mycount,
          TO_CHAR(TRUNC(creation_date,'MM'),'MONTH') themonth
    FROM  (
            SELECT  column1,
                    creation_date
              FROM  table1
              WHERE column_id IN (2,3,12,67,49,182)
                AND column1 > 0
           UNION ALL
            SELECT  NULL column1,
                    ADD_MONTHS(min_creation_date,LEVEL - 1) creation_date
              FROM  (
                     SELECT  TRUNC(MIN(creation_date),'MM') min_creation_date,
                             TRUNC(MAX(creation_date),'MM') max_creation_date
                       FROM  table1
                       WHERE column_id IN (2,3,12,67,49,182)
                         AND column1 > 0
                    )
              CONNECT BY ADD_MONTHS(min_creation_date,LEVEL - 1) <= LAST_DAY(max_creation_date)
          )
    GROUP BY TRUNC(creation_date,'MM')
    ORDER BY TRUNC(creation_date,'MM')
  / 
  

  >

  and another question, how can I get the two counts of the same column where the condition its diferent?

  SELECT  NVL(COUNT(CASE column2 WHEN 'JOHN' THEN 1 END),0) count_a,
          NVL(COUNT(CASE column2 WHEN 'MICHAEL' THEN 1 END),0) count_b,
          TO_CHAR(TRUNC(creation_date,'MM'),'MONTH') themonth
    FROM  (
            SELECT  column2,
                    creation_date
              FROM  table1
              WHERE column2 IN ('JOHN','MICHAEL')
           UNION ALL
            SELECT  NULL column2,
                    ADD_MONTHS(min_creation_date,LEVEL - 1) creation_date
              FROM  (
                     SELECT  TRUNC(MIN(creation_date),'MM') min_creation_date,
                             TRUNC(MAX(creation_date),'MM') max_creation_date
                       FROM  table1
                       WHERE column2 IN ('JOHN','MICHAEL')
                    )
              CONNECT BY ADD_MONTHS(min_creation_date,LEVEL - 1) <= LAST_DAY(max_creation_date)
          )
    GROUP BY TRUNC(creation_date,'MM')
    ORDER BY TRUNC(creation_date,'MM')
  / 
  

  SY.

• Set a variable to Select count (*)

  Hello
  
  I have the following statement that produce a result of '8' in Oracle SQL Developer.
  
  SELECT count (*)
  LIB_ISBN_T p,
  Table (XMLSequence)
  extract (p.ISBN_PAYLOAD,
  ((("/ ISBNdb/BookList/BookData/subjects/subject")));
  
  How can I get this value in a numeric variable so that I can make some statements about the variable If?
  
  I am using Oracle 10 g and APEX 4
  
  Thanks a lot for your help.
  
  Published by: PhilMan2 on November 29, 2010 16:34

  I learned that I had to use the INTO clause.

• Pl/sql script and select count()

  Hello!
  Is it possible somehow to put the result of (Select Select) count (h.id) in the "utl_file.put_line" (?)
  in this script, plsql?
  
  
  declare
  cursor kursori is
  SELECT count (h.id), n.state
  OF popperson h, popnationality n
  WHERE n.state > 3 and (n.state < 246) or n.state > 246
  and h.registerstate = 1 and h.id = n.state group n.poppersonid;
  Tietue kursori % ROWTYPE;
  tiedosto utl_file.file_type;
  Start
  tiedosto: = utl_file.fopen (' TEST_OUTPUTDIR ',' test.txt ', 'W');
  Open kursori;
  loop
  extract the kursori in tietue;
  When the output kursori % NOTFOUND;
  () UTL_FILE.put_line
  tiedosto, 'Code '. Tietue. State | ' ' || Tietue. ?) ;
  end loop;
  close kursori;
  UTL_FILE.fclose (tiedosto);
  end;
  /
  
  Thank you! OV

  declare
  cursor kursori is
  SELECT count(h.id) cnt, n.state
  FROM popperson h, popnationality n
  WHERE n.state > 3 and (n.state < 246 or n.state > 246)
  and h.registerstate=1 and h.id=n.poppersonid Group by n.state;
  tietue kursori%ROWTYPE;
  tiedosto utl_file.file_type;
  begin
  tiedosto := utl_file.fopen ('TEST_OUTPUTDIR','test.txt', 'W');
  open kursori;
  loop
  fetch kursori into tietue;
  exit when kursori%NOTFOUND;
  utl_file.put_line (
  tiedosto, 'Code ' || tietue.state || ' ' || tietue.cnt);
  end loop;
  close kursori;
  utl_file.fclose(tiedosto);
  end;
  /
  

  p.s: not tested.

  Concerning

  REDA

• Select count (1) in empty_table

  Hi all
  I would like to know why "select count (1) of empty_table ' extractions value 0 instead of return null when the empty_table isn't contains anydata?
  
  Thank you

  Hello

  A query that uses an aggregation (such as COUNT) function will produce a line of production by group, unless you discard some groups with a HAVING clause.
  If you do not have a GROUP BY clause, there will be a group (which includes the entire results set) and therefore a row of output.
  COUNT always returns an integer, never NULL.

  If you really need 0 lines of output in this situation, add a HAVING clause:

  SELECT  COUNT (1)
  FROM    empty_table
  HAVING  COUNT (*) > 0
  ;
  

  If you really need an output line, but NULL in the column NUMBER, use NULLIF:

  SELECT  NULLIF ( COUNT (1)
                  , 0
                  )
  FROM    empty_table
  ;
  

• Select count (1) vs count (*) select

  I apologize if this has been requested previously. Can someone tell me what is the difference between

   select count(1) from <mytable> 

  as opposed to

    select count (*) from <mytable> 

  ?
  
  Thank you

  Select count (1) in the table

  is faster than

  Select count (*) in the table

  but as long as it is to write the statement - reason: you don't have to hit the shift key for writing a 1, while you need the SHIFT key to get a * ;-)

• SELECT COUNT (*) FROM...

  Hello
  I added an oracle db in my project, but I want to have the number of lines in the comics so I decided to use the SELECT Count (*) FROM... command in the BeginIn, but it does not recognize the * so I wrote it in a business auto and nothing.
  
  the problem says:
  ' * ' should not: S: S an idea?
  Thank you

  Hello

  Try:

  numberOfRows as Int
  
  for each element in
      SELECT count(*) as cnt
      FROM customer
      order by name
  do
      numberOfRows = element.cnt
  end
  

  Hope this helps,
  Dan

• Stored error for a SELECT COUNT... in proc

  DB version: 10 gr 2
  
  I was getting error when compiling for a stored procedure for the
  under IF condition

  if (select count(1) from ship_trk_dtl where order_id = p_orderid
  and order_status =110) > 0
  then
  ...

  I don't get this error in DB2. It seems that in Oracle, I need put the result of this COUNT in a variable and use it in the IF condition. Is there an alternative? Why Oracle can't handle such a SELECTION within the AOC?
  
  
  the error was
  

  LINE/COL
  --------------------------------------------------------------------------------
  ERROR
  --------------------------------------------------------------------------------
  128/9
  PLS-00103: Encountered the symbol "SELECT" when expecting one of the following:
  
     ( - + case mod new not null others <an identifier>
     <a double-quoted delimited-identifier> <a bind variable> avg
     count current exists max min prior sql stddev sum variance
     execute forall merge time timestamp interval date
     <a string literal with character set specification>
     <a number> <a single-quoted SQL string> pipe
  
  LINE/COL
  --------------------------------------------------------------------------------
  ERROR
  --------------------------------------------------------------------------------
     <an alternatively-quoted string literal with character set specification>
     <an alternativ
  
  129/35
  PLS-00103: Encountered the symbol ")" when expecting one of the following:
  
     * & - + ; / at for mod remainder rem <an exponent (**)> and
     or group having intersect minus order start union where
     connect || multiset

  Published by: kraljic on March 4, 2009 04:05

  Hello

  Born to be used IN the clause to store the code SQL train in a variable. You can use the varuiable with IF.

  SQL> DECLARE
    2  a NUMBER(2);
    3  BEGIN
    4  SELECT COUNT(*) INTO a FROM DUAL;
    5  DBMS_OUTPUT.PUT_LINE(a);
    6  END;
    7  /
  
  PL/SQL procedure successfully completed.
  
  SQL> set serveroutput on
  SQL> /
  1
  
  PL/SQL procedure successfully completed.
  
  SQL>
  

  See you soon,.

• Is it necessary that 'we should select count (*)' before deleting the recor

  Hai...
  
  I need to delete a record in my application for which I wrote a process of pl/sql below...
  
  DECLARE
  
  Symbol varchar2 (20);
  CTN number (1);
  
  BEGIN
  
  Symbol: =: P1_HIDDEN_FLAG;
  Select count (*) in ctn to emp1 where EMPNO = symbol;
  
  If NTC > 0 then
  Remove from emp1 where EMPNO = symbol;
  
  End if;
  End;
  
  
  why we must select count (*) table... If we try to remove a record that is not available in the table... How can we handle this Exception? There are also that "we should select count () before you delete the record from the table... *"
  
  Please tell me...
  
  David...

  Hello

  You can use SQL % number of LINES:

  delete from emp where empno = p;
  if sql%rowcount = 0
  then -- Nothing deleted!
  end if;
  

  Greetings,
  Roel

  http://roelhartman.blogspot.com/
  http://www.bloggingaboutoracle.org/
  http://www.Logica.com/

• SELECT count VS table1 (column1) select count (*) from table1

  SELECT count VS table1 (column1) select count (*) from table1
  Which is faster, or are they equal in the aspect of the effectiveness and the cost of memory?

  Hello
  Reading this thread Øvre Asktom. You do not need to read anything except this, that would be perfectly answer to your question.
  http://asktom.Oracle.com/pls/asktom/f?p=100:11:P11_QUESTION_ID:1156159920245
  HTH
  Aman...

• How COUNT (*) SELECT all first before returning SELECT *.

  Our interface involves a grid filled by a SELECT query. The records are retrieved via a complex query with many tables involved and spent many filtering parameters. A simplified example:

  SELECT col1, col2,... colx

  OF tab1 tab2, tab 3 t3 t2, t1, etc.

  WHERE

  T1.Key1 = t2.key1

  and t2.key2 = t3.key2,

  and... etc.

  and t1.coldate > p_FilterDateFrom

  and t1.coldate < p_FilterDateTo

  and t2.somefield = p_FilterSomeFilter

  and t3.someotherfield = p_FilterSomeOtherField

  and... etc.

  Generally, the user enters parameters, so a small, manageable resultset is returned.

  But sometimes the user will enter the parameters that returns thousands of lines. As a result, the frontend in IE makes a break from time to time say ' Stop running this script? A script on this page slows down your web browser to run slowly... »

  I would like to run the above example query with a COUNT (*) SELECT all first before running the actual SELECT col1, col2, col3. This way if the rows returned exceeds a certain threshold, say, 500 lines, I could pop a message saying "more than 500 rows will be returned. Do you want to continue? ». If the user clicks Yes, then I go ahead and perform the actual query and fill the grid. If the user clicks on no, then the user gets a chance to adjust its settings.

  Y at - it an easy way to do short of coding (essentially) two versions of the same complex query, one for "SELECT COUNT (*)" and the other for "SELECT?"

  Thank you.

  Hey, Justin (or someone else). I quite agree with you on this... However, just to play the lawyer of the devil for a second... (or maybe not... so why I asked)

  The COUNT (*) Analytics as a separate and additional column has been added to the query would be a significant hit to the performance? I have simply discarded with a little, but set of samples was not big enough - I'll try a larger, later when I get time.

  something like:

  1. SELECT *.
  2. DE)
  3. SELECT col1, col2,... colx, count (*) NTC)
  4. OF tab1 tab2, tab 3 t3 t2, t1, etc.
  5. WHERE
  6. T1.Key1 = t2.key1
  7. and t2.key2 = t3.key2,
  8. and... etc.
  9. and t1.coldate > p_FilterDateFrom
  10. and t1.coldate<>
  11. and t2.somefield = p_FilterSomeFilter
  12. and t3.someotherfield = p_FilterSomeOtherField
  13. and... etc.
  14. order of something)
  15. where rownum<=>

  So, you can then enter the total number of any line (probably the first) and know how much you have?

  I'm sure it's more work than simply without... However, I guess that the real question... How much better it is than to the separate account? (if applicable)

• How to get the total line count COUNT (*) SELECT and put on a page?

  Hello
  
  I use JDeveloper 10.1.3.4. I need get the total number of rows in a table and display it on a page and the problem in doing so. At the sqlplus prompt the row count simply would be, for example:
  

     select count(*) from BILL;

  I wonder if having this simple number must be so complicated and if there is more simple, better ways. Here's how I do it and the problem encountered.
  
  1. the name of the page to display the number is summary.jspx. It has a grain of support that "summed" as the managed bean name in faces - config.xml, and the name of the bean class is "summary." The component output on the page is:
  

  <h:outputText value="#{summary.totalStudentsCount}"
                binding="#{summary.outputText5}" id="outputText5"/>

  2. in summary the bean code is:
  

      private Number totalStudentsCount;
      public static int NUMBER = Types.NUMERIC;
  
      public void setTotalStudentsCount(Number totalStudentsCount) {
          this.totalStudentsCount = totalStudentsCount;
      }
  
      public Number getTotalStudentsCount() {
          ZBLCModuleImpl zblcam = getZBLCModuleImpl();
          LoggedInStudentImpl studentTable = (LoggedInStudentImpl)zblcam.getLoggedInStudent();
          String sql = "select count(lsap_uid) from BILL";
          studentTable.setQuery(sql);
          return (Number)CallStoredFunction(NUMBER, "get_total_students(?)", new Object[] {});
      }
  
      private ZBLCModuleImpl getZBLCModuleImpl() {
          FacesContext fc = FacesContext.getCurrentInstance();
          ValueBinding vb = fc.getApplication().createValueBinding("#{data}");
          BindingContext bc = (BindingContext)vb.getValue(fc);
          DCDataControl dc = bc.findDataControl("ZBLCModuleDataControl");
          ApplicationModule am = (ApplicationModule)dc.getDataProvider();
          return (ZBLCModuleImpl)am;        
      }
  
      protected Object CallStoredFunction(int sqlReturnType, String stmt, Object[] bindVars) {
          CallableStatement st = null;
          ZBLCModuleImpl zblcam = getZBLCModuleImpl();
          try {
              st = zblcam.getDBTransaction().createCallableStatement("begin ? := " + stmt + "; end", 0);
              st.registerOutParameter(1, sqlReturnType);
              if (bindVars != null) {
                  for (int z = 0; z < bindVars.length; z++) {
                      st.setObject(z + 2, bindVars[z]);
                  }
              }
              st.executeUpdate();
              return st.getObject(1);
          }
          catch (SQLException e) {
              throw new JboException(e);
          }
          finally {
              if (st != null) {
                  try {
                      st.close();
                  }
                  catch (SQLException e) {
                      throw new JboException(e);
                  }
              }
          }
      }

  The idea of calling a stored function usnig as a "helper" method is 25.5.3 in the Developer's guide, which is closest to you in my need. It's for the functions with the one IN argument; but in my case, the function is not any argument IN. That's why, when you call the helper method CallStoredFunction(), I gave an empty as the last argument and amazing array that caused the problem:
  

  return (Number)CallStoredFunction(NUMBER, "get_total_students(?)", new Object[] {});

  3. the registered function has been tested and works fine at the sqlplus prompt:

  create or replace function get_total_students
     return NUMBER
  AS
     v_student_count NUMBER;
  BEGIN
     select count(ldap_uid)
     into v_student_count
     from bill;
     return v_student_count;
  END;

  4. when the summary.jspx page is run, the browser is full of error messages, the first long line is here (I have split several online for ease of reading):

  javax.faces.el.EvaluationException: 
    javax.faces.el.EvaluationException: 
      Error getting property 'totalStudentsCount' from bean of type 
      zblc.viewcontroller.backing.staff.Summary: oracle.jbo.JboException: 
        JBO-29000: Unexpected exception caught: 
          java.sql.SQLException, msg=Missing IN or OUT parameter at index:: 2

  Thus,.
  (1) what is the problem? What is this parameter IN or OUT of {color: red} index: 2 {color} consult? It has to do with the empty array as the last argument in the call to the helper method?
  (2) this approach is an overdose, and are there more simple and better ways?
  
  Thank you very much for help!
  
  
  Newman

  Hello

  Is there a specific reason why you don't simply create read only object to display with some count (*) as OFCASES from MYTABLE and then just drag and drop the attribute ofcases in page?

  Kind regards

  Branislav

• count all values with a special WHERE clause in a select group?

  Hello
  
  I have the following table 1:
  
  code, month, value
  * 1,1,40 *.
  * 1,2,50 *.
  * 1,3,0 *.
  * 1,4,0 *.
  * 1,5,20 *.
  * 1,6,30 *.
  * 1,7,30 *.
  * 1,8,30 *.
  * 1,9,20 *.
  * 1,10,20 *.
  * 1,11,0 *.
  * 1,12,0 *.
  
  * 2,1,10 *.
  * 2,2,10 *.
  * 2,3,20 *.
  * 2,4,20 *.
  * 2,5,20 *.
  * 2,6,30 *.
  * 2,7,40 *.
  * 2,8,50 *.
  * 2,9,20 *.
  * 2,10,20 *.
  * 2,11,20 *.
  * 2,12,20 *.
  
  
  This is a table with 3 columns, first column is a code, second is the number of months, third, one is a value.
  Now, I want to select records for each code. For example, all records for the code = 1.
  I want to count how many values = 0 for this code = 1. After this count, I want to update the value with the number 0.
  
  For my example:
  Code 1, there are 4 fields with the value 0. So, I want to update all values from code 1 to 4.
  The second code = 2 there is no value = 0. So, I want to update the values of code2 to 0.
  
  This should be the result:
  code, month, value
  * 1,1,4 *.
  * 1,2,4 *.
  * 1,3,4 *.
  * 1,4,4 *.
  * 1,5,4 *.
  * 1,6,4 *.
  * 1,7,4 *.
  * 1,8,4 *.
  * 1,9,4 *.
  * 1,10,4 *.
  * 1,11,4 *.
  * 1,12,4 *.
  
  * 2,1,0 *.
  * 2,2,0 *.
  * 2,3,0 *.
  * 2,4,0 *.
  * 2,5,0 *.
  * 2,6,0 *.
  * 2,7,0 *.
  * 2,8,0 *.
  * 2,9,0 *.
  * 2,10,0 *.
  * 2,11,0 *.
  * 2,12,0 *.
  
  
  My question is:
  Is it possible in oracle to count in a select (or in an insert/update statement) all values = 0 for a group (in this example, named code) and make an update in the same statement for this group?
  
  I hope someone can give me a hint, if possible?
  
  Thank you very much.
  Best regards
  
  
  Tim

  something like that? NOT TESTED *.

  Setting a DAY Table1 a SET A.Value = (SELECT COUNT (B.ROWID) FROM Table1 B WHERE A.Code = B.Code AND B.Value = 0);

• Could this be possible SELECT MAX (COUNT (ID))?

  Hi all
  I created the following table:

  CREATE TABLE ReturnedGoods
  
  (
  
       ID                    NUMBER(10)             PRIMARY KEY,
  
       ReturningReason       VARCHAR2(50)           NOT NULL,
  
  );

  And I have these data in the table:
  

  ID     |     ReturningReason
  
  -------------------------------------
  
  1      |             'Corrupted'
  
  2      |             'Bad'
  
  3      |             'Corrupted'
  
  4      |             'Antics;
  
  .       |               .
  
  .       |               .
  
  .       |               .

  I want to get most ReturningReason occurrence, so I get the count of each ReturningReason, but I can not choose the most of them
  

  --Code Select COUNT for every ReturningReason
  
  SELECT COUNT(ID), ReturningReason
  
  FROM Returned_Goods
  
  GROUP BY ReturningReason

  So, how to get maximum form them?
  
  Thanks in advance :)

  Try this:

   select *from
  (
  SELECT COUNT(ID) cnt, ReturningReason
  FROM ReturnedGoods
  GROUP BY ReturningReason
  ) where rownum=1