Confusion in the result...

Oracle 10g version

Hi gurus

I have the sample data.

Examples of data

as with a reference
(
Select 'AAA' crt_file, 'A1' scode of union double all the
Select 'AAA' crt_file, 'A2' from dual union all
Select "AAA" crt_file, null of union double all the
Select 'BBB' crt_file, 'A1' scode of union double all the
Select 'BBB' crt_file, 'A2' from dual union all
Select 'BBB' crt_file, the double null

)
Select * reference
where crt_file = "AAA".
(scode = & s_cd
Gold 1 = 1
);

When I 'A1' and then it will show all the result against AAA, but I think he should return only 1 row which is 'A1' not all the lines for crt_file = YYYY.

Please advice

Concerning

Matt

Hello

Matt. wrote:

Hi Frank

Sorry to bother you again, you said.

If p is true, then there is no need to evaluate q.  If p evaluates to false or Unknown, q must be evaluated.

Anyway

In my case it's the same when I pass the parameter 'A1' then left condition site do not TRUE so no need to assess 1 = 1 condition and then the result should be stored not all one line... Please suggest

When you pass the parameter 'A1', then sometimes the left side of the condition-GOLD, it's TRUE and on these lines there is no need to evaluate the right.side.

When you pass the parameter 'A1', then sometimes the left side of the OR condition is FALSE or UNKNOWN and on these lines it is necessary to assess the right.side

Whatever either, or the condition there the TRUE value...

As stew said in response to #9, the WHERE clause is evaluated for each row.  The results you get from a line do not affect the results you get on another line.  That's the whole point of a WHERE clause, is not?  In general, you want something that will be TRUE for some lines, but not for the other lines.

When you pass 'A1' as a parameter, you say that you expect the results to include 'all lines', but I think it's fair to say "all lines containing ="AAA"crt_file", as you said in your original message.  The condition

crt_file = "AAA".

must be evaluated on each row independently the other lines.  It is the same for all rows in the table.

When it's time to decide whether to include this line:

Select 'AAA' crt_file, 'A2' from dual union all

so, if & s_code = 'A1', the line will be included.  Why?  First of all, the condition on the left side of the AND, which is

crt_file = "AAA".

is evaluated.  This State is set to TRUE for this line, so it is necessary to evaluate the right side of the AND, which is itself a condition GOLD-composed.  The left side of the GOLD, it's

SCODE = & s_cd

is evaluated, and it turns out to be FAKE for that line, so the right side of the GOLD, it's

1 = 1

is evaluated, and which proves to be TRUE, then, on this line, WHERE any condition, i.e.

crt_file = "AAA".

(scode = & s_cd
Gold 1 = 1
)

takes the value

TRUE

and (FAKE

or TRUE

)

that is the same

TRUE

and ago (REAL

)

that is the same

TRUE

How this condition was assessed on the first line has no impact on how it will assess on other lines.  (And even if it did, how do you know what the first line?  Rows in a table have no built-in command.  If you run the same query over and over, different lines can be read first every time.)

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  • Select a table returned in the result of the query

    Hi, I'm trying to find a way to query a table name that I'm back to a different query. I am doing this in pure SQL and PL/SQL, if I can.

    Here's the situation. I have a table called FILES, a table called TYPE and an unknown number of different reference tables with different names.

    Each entry in the FILE has a reference to a TYPE id, and each entry type is a varchar that contains the name of a table reference, such as PHOTO_INFORMATION, PDF_INFORMATION or XML_INFORMATION.

    I want to be able to extract the data from the reference table for any data file. So with a file id, I question TYPE to get the name of the reference table (IE, "PHOTO_INFORMATION" back) then the request it is at this table for all of its columns, using the reference id in the FILE table.

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   (     "FILE_ID" NUMBER, 
     "FILE_NAME" VARCHAR2(4000), 
     "FILE_TYPE" NUMBER, 
     "REFERENCE_ID" NUMBER, 
      CONSTRAINT "AA_TEST_FILE_PK" PRIMARY KEY ("FILE_ID") ENABLE
   )
/

CREATE TABLE  "AA_TYPE" 
   (     "TYPE_ID" NUMBER NOT NULL ENABLE, 
     "REFERENCE_TABLE" VARCHAR2(4000), 
      CONSTRAINT "AA_TYPE_PK" PRIMARY KEY ("TYPE_ID") ENABLE
   )
/

CREATE TABLE  "AA_FILETYPE1" 
   (     "REFERENCE_ID" NUMBER, 
     "DATE_MODIFIED" DATE, 
     "SUMMARY" VARCHAR2(4000), 
     "TOTAL_VALUE" NUMBER(5,2), 
      CONSTRAINT "AA_FILETYPE1_PK" PRIMARY KEY ("REFERENCE_ID") ENABLE
   )
/

CREATE TABLE  "AA_FILETYPE_PHOTO" 
   (     "REFERENCE_ID" NUMBER NOT NULL ENABLE, 
     "DATE_TAKEN" DATE, 
     "CAMERA_NUMBER" VARCHAR2(4000), 
     "WEATHER_CONDITIONS" VARCHAR2(4000), 
     "CONSULTANT_NAME" VARCHAR2(4000), 
      CONSTRAINT "AA_FILETYPE_PHOTO_PK" PRIMARY KEY ("REFERENCE_ID") ENABLE
   )
/
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    select * from (select REFERENCE_TABLE from AA_TYPE where TYPE_ID = AA_FILES.FILE_TYPE) where REFERENCE_ID = AA_FILES.REFERENCE_ID;
    So who withdrew all the columns in the reference given in AA_TYPE table based on an entry in AA_FILES.

    I'm not entirely sure how to do this, or if this is possible even without using PL/SQL.

    I'm open to suggestions on how to achieve what I want with a different design of table, I am a student and I'm not really experienced in database design. (My first design of database class isn't until next year!)

    Thank you very much!

    Hello

    [email protected] wrote:
    Sorry about the confusion about file_id = 3, I meant the insert in the third I've included. I did not indicate the id_fichier in my inserts since it is the main key and it auto increments.

    It is important to post of the CREATE TABLE and INSERT statements that work. All those who want to help you to will want to recreate the problem and test solutions. Also, do not use strings for all entries. If the column is a NUMBER, use a NUMBER in the INSERT statement. If the column is a DATE, use a DATE or a function that returns a DATE.
    So you should post something like:

    insert into AA_FILES(FILE_ID, FILE_NAME, FILE_TYPE, REFERENCE_ID) values (1, 'test-photo-1.jpg',  1,  1);
insert into AA_FILES(FILE_ID, FILE_NAME, FILE_TYPE, REFERENCE_ID) values (2, 'test-xml-1.jpg',    2,  2);
insert into AA_FILES(FILE_ID, FILE_NAME, FILE_TYPE, REFERENCE_ID) values (3, 'test-photo-2.jpg',  1,  2);
-- The value file_type=1 immediately above was not in your original data, but seems to be what you meant.

prompt =====  AA_TYPE Table:  =====

insert into AA_TYPE(TYPE_ID, REFERENCE_TABLE) values (1, 'AA_FILETYPE_PHOTO');
insert into AA_TYPE(TYPE_ID, REFERENCE_TABLE) values (2, 'AA_FILETYPE1');

prompt =====  AA_FILETYPE1 Table:  =====

insert into AA_FILETYPE1 (REFERENCE_ID, DATE_MODIFIED,                 SUMMARY,                                    TOTAL_VALUE)
       values           (1,           TO_DATE ('01-01-02', 'MM-DD-RR'), 'An XML file that has some information about something', '14');

prompt =====  AA_FILETYPE_PHOTO Table:  =====

insert into AA_FILETYPE_PHOTO (REFERENCE_ID, DATE_TAKEN,                 CAMERA_NUMBER, WEATHER_CONDITIONS, CONSULTANT_NAME)
                values            (1,          TO_DATE ('01-01-01', 'MM-DD/RR'), 'abc123',      'rainy!',         'John Smith');
insert into AA_FILETYPE_PHOTO (REFERENCE_ID, DATE_TAKEN,                 CAMERA_NUMBER, WEATHER_CONDITIONS, CONSULTANT_NAME)
                values            (2,          TO_DATE ('01-01-02', 'MM-DD/RR'), 'def456',      'slightly cloudy',  'Jane Jones');
commit;

    To give you my workplace, I'm applying in Application Express. A user has entered the number '3' the file_id (I'm not worried about the distinction between passing in the id_fichier and the name of the file, I just my application one application or the other).

    Now, run a query that will get related data which table it is stored in. I don't know the name of the table at design time, as that particular file may be of any type (each of which has a different table name). However, with a the file_id, I have a file_type (in aa_files) which refers to an entry in aa_type.

    I see. You could add even add new tables after this query is written. As long as the new table has a column named reference_id, and there is a line for the new table in aa_files, the following query should work.

    >

    select FILE_TYPE
from AA_FILES
where FILE_ID = 3

    I stored the name of the table, I need to ask for the rest of the data in aa_type at design time, so using the file_type value, I can get the name of reference_table:

    select REFERENCE_TABLE from AA_TYPE where FILE_TYPE = 1

    In the sample data, you have validated, Type_de_fichier = 2 on the 3rd row. I've changed that in my example 1 revised data.
    Be very careful that your explanation fits your data. You talk to people who know about your application, and it is very easy for them to be induced in error or confusion.

    Now the '1' is here that the first query would return. I would like to use a subquery to combine these two queries into a single (I think?). This second query would return "AA_FILETYPE_PHOTO", which is the reference table.

    So I have the reference table, which is a name of table to another table in my database. It contains the data that I'm actually looking for. I want it for this particular file (file_id 3), and in aa_files, I have a value of "reference_id", which refers to the respective line in the reference table. File_id 3, the reference_id is 2.

    select * from AA_FILETYPE_PHOTO
where reference_id = 2

    If the above query gets me my final data.

    Now, I've been watching substitution values and bind variables, here's another way to explain what I want:

    Explanation step by step below is very useful. It would be more useful if each step uniquely and gavce movement results given the sample data and an example of setting (3 in this case)

    -- get the file_type from aa_files for the desired file
EXEC :file_type := (select file_type from aa_files where file_id = 3);

    That we will call the step step (a) above.
    Step (a) sets: Type_de_fichier 1 (given my corrected sample data)

    -- get the reference table from aa_types using the file_type
EXEC :reference_table := (select reference_table from aa_type where type_id = :file_type);

    That we will call the step step (b) above.
    (B) sets the stage: reference_table to 'AA_FILETYPE_PHOTO '.

    -- get the reference_id from aa_files for the desired file
EXEC :reference_id := (select reference_id from aa_files where file_id = 3);

    That we will call the step step (c) above.
    (C) sets the stage: reference_id 2

    -- using the reference table and reference id for the desired file, get the rest of the data
select * from :reference_table where reference_id = :reference_id;

    Not sure if this makes it more clear or not.

    Yes, it helps a lot.

    Basically I have a table full of table names. How do I write a query that pulls one of these table names and it then queries?

    You need SQL dynamic, because you can't hardcode a table name in the query that you normally would be.
    How dynamic SQL works normally (and the functioning of this example) are that the query is built by using a variable. In SQL * more (as shown below), you can simply use a variable substitution instead an identifier hardcoded, and that's what it takes to make the dynamic query from SQL * more resolves the substitution variables before sending the code for the compiler. I don't know much on the Apex, but I bet there's some way to do dynamic SQL in the Apex, too.
    So the dynamic part here should include step d, since you can't hardcode the name of the table in the query.
    Until we can step (d), then, did they to us to do the steps (a) and (b) to obtain this file name. In the example blelow, I used a separate, preliminary request to get the & table_name...
    Step (c) could be made in the main query, using a subquery or a join. However, I chose to step (c) in the preliminary motion, as well as steps (a) and (b), since it's the same table same step (a). In this way, step (d) must refer to a table.

    Here's (finally) how to make this work in SQL * more:

    ACCEPT     file_id     PROMPT     "Enter the file_id (a number, e.g. 3): "

-- Preliminary Query, to set table_name

COLUMN     reference_id_col     NEW_VALUE     reference_id
COLUMN     table_name_col           NEW_VALUE     table_name

SELECT  f.reference_id          AS reference_id_col
,     t.reference_table       AS table_name_col
FROM      aa_files     f
JOIN     aa_type          t     ON     f.file_type     = t.type_id
WHERE     f.file_id     = &file_id
;

--     Main Query

SELECT  *
FROM     &table_name
WHERE      reference_id     = &reference_id
;

    The results, account required to the data from the sample I posted above, and the & file_id 3, are:

    `                      CAMERA_    WEATHER_        CONSULTANT_
REFERENCE_ID DATE_TAKE NUMBER     CONDITIONS      NAME
------------ --------- ---------- --------------- ---------------
           2 01-JAN-02 def456     slightly cloudy Jane Jones

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