Use of variables in SQL statements

Hi,
I am looking for for a way to set a variable which will be referenced several times within a UNION query.
Something like:
Var=3
SELECT * FROM VIEW_1 WHERE FIELD_1 = Var
UNION
SELECT * FROM VIEW_2 WHERE FIELD_1 = Var
UNION
SELECT * FROM VIEW_3 WHERE FIELD_1 = Var
Instead of something like:
SELECT * FROM VIEW_1 WHERE FIELD_1 = 3
UNION
SELECT * FROM VIEW_2 WHERE FIELD_1 = 3
UNION
SELECT * FROM VIEW_3 WHERE FIELD_1 = 3

I'm sure that for this you were requiring a database solution and not a sqlplus solution ? If so, then you have a couple of options:-
1) change the Var to a function call and have the function return a packaged variable or value in a lookup table that you can set as you require [ i.e. WHERE FIELD_1 = your_function ].
2) use an application context, such that you set an attribute within the context and use it within the view [ i.e. WHERE FIELD_1 = SYS_CONTEXT( 'your_context', 'your_attribute' ) ].
In both methods, you will need to set the value of your variable before referencing the view. The view therefore becomes "parameterised" in this sense.
It might be possible that your view is mergeable. By this I mean that Oracle might be able to push a predicate against the view inside it instead, such that Oracle rewrites this:-
SELECT <cols>
FROM your_union_view
WHERE field_1 = 3;
...and takes that value of field_1 = 3 and "pushes" it into your_union_view itself, in which case you will not need to worry about any of the above solutions. You can test this out by removing the where clauses from your view definition and running an explain plan against a query of the form above. If you see a "VIEW" step in the results, then the view is not mergeable in its current form and you should revert to the methods I listed.
Regards
Adrian
For this you can use application contexts

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Using bind variables with sql statements

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Cheers and thanks a lot :)
Michael Sonntag

We connect from a VB 6.0 program via OO4O to an Oracle 8.1.7 database, using bind variables in connection with select statements. Running ok, but performance again by using bind vars not as good as expected!
When looking into the table v$sqlarea, we were able to detect the reason. We expected that our program submits the sql statement with bind vars, Oracle parses this once, and with each select statement again, we do not have a reparse. But: It seems that with each new session Oracle reparses the sql statement, that is, Oracle is not able to memorize or cache bind vars and statements. Even more worrying, this kind of behaviour was visible with each new dynaset, but the same database/session.
Is there anybody our there with an idea of what is happening here?
Code snippet:
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Cheers and thanks a lot :)
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Can we use repository variables in SQL statement of column prompt?

Hi Dudes,
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Report Date and Time:
26-OCT-2010 15:44:13
List of Unapproved Adjustments
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Using Collection in a sql statement.

Hi I want to perform the following statement:
DELETE FROM ALLOCATION_ELEC_MATRIX
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then later on the collection gets filled. But how can i get it to work to use it in my sql statement?
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The standard approach is to use SQL collection type and table function,
for example
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2 /
Type created.
SQL> create or replace package my_pkg
2 is
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5 end;
6 /
Package created.
SQL> create or replace package body my_pkg
2 is
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4   is
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6    return lt_inter_dgos;
7   end;
8 end;
9 /
Package body created.
SQL> begin
2   my_pkg.lt_inter_dgos.extend(3);
3   my_pkg.lt_inter_dgos(1) := 'SMITH';
4   my_pkg.lt_inter_dgos(2) := 'KING';
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6 end;
7 /
PL/SQL procedure successfully completed.
SQL> select ename from emp;
ENAME
SMITH
ALLEN
WARD
JONES
MARTIN
BLAKE
CLARK
SCOTT
KING
TURNER
ADAMS
JAMES
FORD
MILLER
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WARD
JONES
MARTIN
BLAKE
CLARK
SCOTT
TURNER
ADAMS
JAMES
FORD
MILLER
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PL SQL using variable in SQL statement

I am trying to execute several sql statements, that have the same format but different values. Does this
mean I need a bind variable?
ie
select TO_CHAR ( (SYSDATE - 2), 'YYYY_MM_DD') from dual
select TO_CHAR ( (SYSDATE - 4), 'YYYY_MM_DD') from dual
select to_char(add_months(sysdate,-2*1) from dual
When I try to put the values into a varaiable (date, varchar2 or number) I am getting a conversion
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Can somebody show me an example of how to do something like this? Or at least point me to the correct
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val :=add_months(sysdate,-2*1
select to_char(val) from dual
Thanks in advance to all who answer

Hi,
840386 wrote:
I am trying to execute several sql statements, that have the same format but different values. Does this
mean I need a bind variable?No, you don't need a bind variable, though bind variables may be more efficient than using PL/SQL variables. I don't see where you're trying to use any varibables at all in your examples. Is it in place of the literals, such as 2 or 'YYYY_MM_DD'? You can use either bind varibales or PL/SQL variables in those places.
ie
select TO_CHAR ( (SYSDATE - 2), 'YYYY_MM_DD') from dual
select TO_CHAR ( (SYSDATE - 4), 'YYYY_MM_DD') from dual
select to_char(add_months(sysdate,-2*1) from dualIn PL/SQL, when you have a SELECT statement, you must specify what you want to do with the results. For example, a SELECT ... INTO statement:
SELECT AVG (sal)
INTO    avg_salary
FROM    scott.emp;There's usually no point in SELECTing from dual in PL/SQL. It's not an error, but it's simpler just to use an assignment statement.
When I try to put the values into a varaiable (date, varchar2 or number) I am getting a conversion
error.Post a complete procedure or anonymous block, including variable declarations, that shows exactly what you're trying to do.
>
Can somebody show me an example of how to do something like this? Or at least point me to the correct
part of the documentation that provides and example. Pardon my syntax as I know it is incorrect
val :=add_months(sysdate,-2*1Assuming val is a DATE, that's basically correct. You have unbalanced parentheses (there's a '(', but no matching ')' ), and you need a semicolon (';') at the end of the statement. Perhaps ');' just got cut off when you were posting this.
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Usually, the reason why you need to call TO_CHAR is that you want a value in a particular format, which is specified in the 2nd argument to TO_CHAR. Calling TO_CHAR with only one argument is a possible mistake, but not something that would raise an error.
Here's an example that works:
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DECLARE
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Use variable in SQL statement

HI guys:
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Sample code:
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Could I write a FORM gather them with transporting a parameter ZPLPX to determine which condiniton will be execute?
thank you very much.

Hi tianli,
1. source text
   This concept of dynamic where
   condition is called source text.
2. use like this.
   This is important in the code ---> WHERE (mywhere).
REPORT abc LINE-SIZE 80.
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regards,
amit m.

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I'm new to Crystal Reports, so pardon my ignorance.
I need to write a SQL statement in Crystal Reports (Ver. 11) that uses results from a query and stores them in a variable for further use in the statement. Something like this:
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Hi,
Is it possible to write a sql statement like the one below (not plsql)?
if (select 'True' from dual) = 'True' -- 1
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Billy Verreynne wrote:
The case syntax is a bit funny though as there's not a single condition evaluation (like a DECODE or case structs from some other languages).
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?:| You mean like this...?
SQL> ed
Wrote file afiedt.buf
1 select empno, ename, deptno
2        ,case deptno
3           when 10 then 'This is Department 10'
4           when 20 then 'And department 20'
5           when 30 then 'And of course department 30'
6         else
7           'Blimey it is something else!'
8         end as dept_desc
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SQL> /
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      7499 ALLEN              30 And of course department 30
      7521 WARD               30 And of course department 30
      7566 JONES              20 And department 20
      7654 MARTIN             30 And of course department 30
      7698 BLAKE              30 And of course department 30
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      7788 SCOTT              20 And department 20
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      7876 ADAMS              20 And department 20
      7900 JAMES              30 And of course department 30
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thanks Tamas.... i knew it was something simple... code works great now.

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hi all
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select
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) the_employees
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thnx in advance

RTFM
http://download.oracle.com/docs/cd/B19306_01/appdev.102/b14261/sqloperations.htm#sthref1452
Cheers
Sarma.

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Hi folks,
I would like to use a sql statement which includes single quotes "'" into my NDS statement.
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I got it. In order to distinguish between data single quote and varchar sigle quote, you need to use 2 single-quotes instead of one in DATA.
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SQL>
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2 /
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Sarma's
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Sarma.

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can someone tell me if there is a way to find out what the bind variables values are in an sql statement extracted from any of the v$sql or v$sqlarea type tables ?
sql example:
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Hi damorgan
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