Oracle data type

Similar Questions

• Oracle data type: on storage data as NUMBER of versus BINARY_DOUBLE?

  My request did a lot of scientific computing. The calculation uses double-precision variables in C and Java (both based on IEEE 754).
  
  If my goal is to store these variables in Oracle 11.2 G database between the calculations, such as the value read FROM the database is an exact match with the value that is used to write to the database, would you recommend store variables as an Oracle Data Type of NUMBER of DOUBLE BINARY?
  
  And, why?
  
  Here, I am only concerned about the accuracy (speed or storage).

  918175 wrote:
  Same double precision in Java and C have figures largely exceeded 17 (decimal) (I forgot the exact number of digits, but he has more than 30 years). I guess what I mean is accurate with respect to the first 17 digits (decimal), as the others have little or no effect in calculations.

  If you care just the 17 first decimal digits being the same after the persistence of data, it should not matter if you use NUMBER or BINARY_DOUBLE (or RAW). I prefer strongly NUMBER or BINARY_DOUBLE because then, you can use data outside your application in the future if someone wants to write a report.

  Justin

• Create a table with all kinds of oracle data types?

  Hello
  who can give me a small example to create a table with all kinds of oracle data types? and the example to insert it?
  
  Thank you
  Roy

  Hello

  Read the fine manual. It contains examples at the end of the chapter.

  http://download.Oracle.com/docs/CD/B19306_01/server.102/b14200/statements_7002.htm

  I don't know if you know that you can also create your own data types using 'create a type '. So look for examples that are of your interest and not for all types of data.

  Concerning

  Published by: skvaish1 on February 16, 2010 15:33

• Data selection in UDB where columns were named after the oracle data types

  I have a couple of tables in UDB, I'm trying to reference on a HS db link.

  The first table on the side of the UDB has a column named 'number' (bought the software - not something we did)...

  Selecting this SEO column in this table and more specifically (i.e. Select number, col2, col3 etc) causes the error ORA-00936 (missing expression).

  Select * works...

  The second table also has a column called 'number', so the same problem above applies.  [However, sql errors when I do a select * from ORA-00600: internal error code, arguments: [HO set: look long], [], [], [], [], [], [], [], [], [], []]

  Our dba lean on it, - Oracle HS is new to us, so - I was hoping someone here might have an idea...

  Using oracle 11.2.0.3.0.

  When your DB2 database has column with reserved words in Oracle names, you must create a view of your DB2 side by specifying a different name for this column, and then use DG4ODBC to choose from the scoreboard instead of DB2.

  Another approach which would require an additional programming is to use the DBMS_HS_PASSTHROUGH that allows to make statements that they are to the DB2 database without be analyzed in Oracle.

  As for the ORA-600 error that you get this error is caused when your DB2 table contains certain character inspired columns that exceed the accuracy of the Oracle and are then mapped to the Oracle long data types. Normally in Oracle each table can have a long column. But to be able to select with the gateways of databases foreign this restriction has been slightly improved and more recent Oracle software can choose from the tables that contain more then a long.

  So, could you please be more specific what program you use to select using the gateway fails with ORA-600 and could you please post your description of the table as it is stored in your DB2 database as seen using the gateway in SQL * more: desc (your DB2 table > @)

  -Klaus

• Oracle data type for a bit column

  I want to add a new column to my table, but I can't seem to find any data type in oracle. the only data on the ground will be 1 or 0. What is the best type of data to use?
  
  Also, is this correct SQL to add a new 'flag' titles to the table tblLocations:
  
  ALTER TABLE tblLocations
  Bit flag ALTER COLUMN
  
  Thank you
  Mark

  user8721624 wrote:
  Also, is this correct SQL to add a new 'flag' titles to the table tblLocations:

  ALTER TABLE tblLocations
  Bit flag ALTER COLUMN

  It should be something like:

   ALTER TABLE tbllocations
   ADD  FLAG_BIT CHAR(1)
  

  I guess you can use the char(1) data type to contain these data. Also, you can create a check on the flag_bit column constraint to ensure that only 0 and 1 can be stored in the column.

  I hope this helps.

  Kind regards
  JO

• Performance/Oracle data types

  Does anyone know how the data types can affect the performance of SQL queries? I would particularly like to know NUMBER, VARCHAR2, and DATE.

  You use the appropriate data type for the data being stored, end of story. Any hypothetical gains you are trying to do by using a data type 'faster' is deleted by bugs or performance issues using the data.

• Subtype and data types

  Hi all
  
  We can overload subprogrammes that setting differ in the number, order, and type of family data. But impossible to overload if the parameter differs only in the void type.
  
  If I see the standard package, I get
  subtype types BINARY_FLOAT is NUMBER;
  subtype BINARY_DOUBLE is NUMBER;
  
  But I am able to overload the two procedures, we have a parameter types binary_float and binary_double other. They are of subtype of the same data type. that is the number. So, how is it possible. Also, most of the subtypes have no difference. So, why are there these number of subtypes? Oracle defines subtypes as data type with some sort of constraint on the base data type, but is valid for all? for example, smallint, and decimal.
  
  type of NUMBER is NUMBER_BASE;
  subtype of FLOAT is NUMBER;
  ACTUAL subtype is FLOAT;
  subtype 'DOUBLE PRECISION' is FLOAT;
  INTEGER subtype is NUMBER (38.0).
  subtype INT is INTEGER;
  subtype SMALLINT is NUMBER (38.0).
  DECIMAL subtype is NUMBER (38.0).
  DIGITAL subtype is DECIMAL;
  DEC subtype is DECIMAL;

  >
  We can overload subprogrammes that setting differ in the number, order, and type of family data. But impossible to overload if the parameter differs only in the void type.

  If I see the standard package, I get
  subtype types BINARY_FLOAT is NUMBER;
  subtype BINARY_DOUBLE is NUMBER;

  But I am able to overload the two procedures, we have a parameter types binary_float and binary_double other. They are of subtype of the same data type. that is the number. So, how is it possible. Also, most of the subtypes have no difference. So, why are there these number of subtypes? Oracle defines subtypes as data type with some sort of constraint on the base data type, but is valid for all? for example, smallint, and decimal.

  type of NUMBER is NUMBER_BASE;
  subtype of FLOAT is NUMBER;
  ACTUAL subtype is FLOAT;
  subtype 'DOUBLE PRECISION' is FLOAT;
  INTEGER subtype is NUMBER (38.0).
  subtype INT is INTEGER;
  subtype SMALLINT is NUMBER (38.0).
  DECIMAL subtype is NUMBER (38.0).
  DIGITAL subtype is DECIMAL;
  DEC subtype is DECIMAL;
  >
  Some of those who, as a smallint, SQL ANSI data types. See table 2-6 ANSI Datatypes converted to Oracle data types in the doc of the SQL language
  http://docs.Oracle.com/CD/B28359_01/server.111/b28286/sql_elements001.htm

  Oracle allows the name of the ANSI data type to use and combines the name of the ANSI for the appropriate Oracle data type
  >
  ANSI SQL/DS and DB2 data types

  The SQL statements that create tables and clusters allows also ANSI data types and products IBM SQL/DS and DB2 data types. Oracle recognizes the ANSI or IBM data type name that differs from the Oracle database data type name. It converts the data type for the equivalent Oracle data type, stores the Oracle data type under the name of the column data type and stores the data in the column in the data type Oracle based on the conversions listed in the following tables.
  >
  But BINARY_FLOAT and BINARY_DOUBLE types are each defined as unique data types (see table 2-1 in this doc).

  Because they are unique Oracle data types, they can be overloaded.

• Mapping of Data Type from SQL Server to Oracle

  I use Oracle 12 c with heterogeneous services connects to SQL server DB. Some of the columns in the SB of SQL Server are defined as 'nvarchar (max). These come to Oracle as columns of type "long". I would like that these are 'varchar2' types in Oracle, so I do not have any restrictions related to the fields of type "long" when using. I can create a view in SQL Server to convert the data type IE. nvarchar (100). What is the highest value that I can use to make the data to display in Oracle as a varchar? BTW, I tried nvarchar (4000), but which showed any longer. I tried nvarchar (1000) and who showed as a varchar.

  The maximum value for an nvarchar2 in Oracle is 2000. Mapping - If the remote column is mapped to an Oracle varchar/nvarchar - depends on the type of data returned by the ODBC driver. When the driver returns SQL_Varchar, then the maximum precision is 4000 and when it will map it to SQL_WVarchar then it's 2000.

  As your Oracle database uses AL32UTF8 as set of characters that the maps to the Oracle long as your SQL Server nvarchar content is stored using characters UCS2 nvarchar (max), you will get the value that is covered by the database Oracle UTF8 character set. So it shouldn't really matter if the returned string is mapped to an Oracle, varchar or nvarchar.

• How can I find what is the data type of a column of a Table in oracle or SQL?

  (a) what happens if I want to know the type of data in a specific column in the Table.

  (b) how to find the column data types?

  Can someone help me please. I am new to oracle and try to learn a few tricks

  Hello

  How to do

  SQL > desc

  SQL> desc emp
   Name                                      Null?    Type
   ----------------------------------------- -------- ----------------------------
   EMPNO                                     NOT NULL NUMBER(4)
   ENAME                                              VARCHAR2(10)
   JOB                                                VARCHAR2(9)
   MGR                                                NUMBER(4)
   HIREDATE                                           DATE
   SAL                                                NUMBER(7,2)
   COMM                                               NUMBER(7,2)
   DEPTNO                                             NUMBER(2)
  

• Oracle DW and necessity of date type.

  Vast majority of designing data warehouses use the granularity of the fact to the date level table. In oracle, you can use only the data type of date (which is not really date rather datatime) to represent the date in truncating the time part of it.
  But it allocates even 7 bytes for headaches from it. One of the competitions of this Oracle the true DATE type that takes just 3 bytes to store the value of type date. You can imagine how much storage space you can save using 3 bytes instead of 7 paintings done great. I think that Oracle needs to come with a similar option soon. It will help a lot in performance and the use of disk space.

  Not really relevant to this forum. The title of the forum clearly States ' * + don't post Product - Related Questions here + * ".

  As to the question that you raised - RDBMS Oracle supports advance user-defined data types. You can easily implement a data byte 3 type date personalized if you wish.

• Change data type for the column in a table - Oracle 8i

  Team,
  
  I need to change a VARCHAR2 column in number.
  
  ALTER table xyz change number abc;
  
  By giving the above statement, it says I need empty this column before you change.
  
  I can't change the data type before emptying this column.
  
  Please indicate any other solution. Give me some suggestions.
  
  Empty the column for me here BIG task.

  user11081688 wrote:
  I can't change the data type before emptying this column.

  Not according to the documentation:

  You can change the data type of any column or decrease the size of the entire column if all rows in the column contains NULL values.

  Please indicate any other solution. Give me some suggestions.

  You can add another column with the correct data type.

  ALTER TABLE xyz ADD COLUMN def NUMBER;
  UPDATE TABLE xyz SET def = TO_NUMBER(abc);
  ALTER TABLE xyz DROP COLUMN abc;
  ALTER TABLE xyz ADD COLUMN abc NUMBER;
  UPDATE TABLE xyz SET abc = def;
  ALTER TABEL xyz DROP COLUMN xyz;
  

  If I remember correctly, Oracle 8i does not support the change of name of column if this solution is a bit more complicated than 9i and above. Another option would be to create a new table with CREATE TABLE AS... SELECT, drop the old one and rename a new one to the old.

• Change data type column - performance of indexes in Oracle 10 g

  Hello
  I have a table with too many lines (lines more than 2000000). I changed the data type (NUMBER of VARCHAR2) of an indexed column (the index is only for this column), using a temporary backup table:
  
  CREATE TABLE BKTABLE AS SELECT FIELD, ROWID AS IDROW ORIGNALTABLE;
  UPDATE ORIGNALTABLE SET FIELD = NULL;
  ALTER ORIGNALTABLE CHANGE THE FIELD VARCHAR2 (256);
  ORIGNALTABLE UPDATE A FIELD SET = (SELECT FIELD OF BKTABLE B WHERE B.IDROW = A.IDROW);
  
  This way worked OK.
  
  There is no performance problem knew about the ORIGNALTABLE index? Need to rebuild this index?
  
  Thks!

  Need to rebuild this index?

  YES

  ALWAYS
  View the name of the operating system (OS) & version for DB Server System.
  View the results of
  SELECT * from version $ v
  or post the Oracle version with 4 decimals

• CfSQLtype and date type oracle

  I have a problem with a SQL Oracle when part of the where clause is:
  and INSPECTION_DATE = < cfqueryparam value = "" #Form.INSPECTION_DATE # "cfsqltype = 'cf_sql_DATE' >"
  It does not, so the SQL is not updated as I expect. I also tried the cf_sql_TIMESTAMP type, but it does not correspond to either. An Oracle date is actually a date and timestamp, but it does not resemble the ColdFusion TimeStamp. No one knows what look like the acutally cf_sql_DATE and cf_sql_TIMESTAMP, so I can use an Oracle to_char() function make them match?
  Thanks for your help.
  Scott
  

  If your Oracle files have something else that zeros in the time portion of the datefield that you won't get a match because the cold fusion will be zeros. There are at least two ways to handle this:

  With the functions, that is to say
  where to_char (date field oracle) = dateformat (date of cold fusion)

  or with an exanded where clause, that is to say
  where oracle_date_field > = cold_fusion_date_you_want
  and oracle_date_field<>

• Convert or map Typedonnees decimal Transact-SQL for Oracle Number data type?

  MSSQL 2005
  Oracle 10.2 g
  
  In a MSSQL table, I have a column with the data type set on (decimal (1.0), null) with the values of line-1. (695 lines in total)
  
  In the Oracle table, the proposed mapped column is a number data type. When I import data, I received 695 errors with the message "invalid value for the field. How to properly convert or map Decimal (MSSQL) Transact-SQL for Oracle Number data type for a negative value?
  
  Thank you.

  How do you load data into Oracle? What tool or programming language you are using? Can you post something cause what you stated in your post should work, but there may be some ODBC, or other type of conversion factors to be taken into account.

   > create table t1 (field1  number(1,0));
  
  Table created.
  
   > insert into t1 values (-1);
  
  1 row created.
  
  UT1 > select * from t1;
  
      FIELD1
  ----------
          -1
  

  HTH - Mark D Powell.

• Syntax of data type and name - still new for Oracle

  If I have an Employees table and that I needed the data type and the name of each column of the EMPLOYEES table
  
  
  What is the syntax?
  
  
  Is - CREATE AN EMPLOYEE in SIGHT?
  
  Thank you
  
  I use Oracle 10g express and Oracle SQL * MORE.
  
  Published by: user11915244 on 24 Sep, 2009 19:03

  call sqlplus

  SQL > DESC EMPLOYEE