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Oracle subquery does not see the variable on second level


Oracle subquery does not see the variable on second level

By : Mateusz
Date : November 28 2020, 11:01 PM
help you fix your problem In Oracle you can use a table alias in an immediate subquery (one level down), but not in more deeply-nested subqueries.
You can go around this with factored subqueries (WITH clause). But in your case, it's not clear why you need a correlated sub-subquery. Move the WHERE condition on matching by partyid to the middle query; that way the inner-most query will be uncorrelated, so it will be computed just once. Move the partyid check next to version = maxversion.
code :


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Oracle subquery does not see the variable from the outer block 2 levels up

Oracle subquery does not see the variable from the outer block 2 levels up


By : jack the shit
Date : March 29 2020, 07:55 AM
Any of those help No, Oracle doesn't correlate the subqueries nested more than one level deep (and neither does MySQL).
This is a well-known problem.
code :
SELECT  p.post_id, c.*
FROM    posts
JOIN    (
        SELECT  c.*, ROW_NUMBER() OVER (PARTITION BY post_id ORDER BY created_date ASC) AS rn
        FROM    comments c
        ) c
ON      c.post_id = p.post_id
        AND rn = 1
How to turn an Oracle multi-parameter subquery into an MS SQL subquery(ies)

How to turn an Oracle multi-parameter subquery into an MS SQL subquery(ies)


By : 357803594
Date : March 29 2020, 07:55 AM
like below fixes the issue We're converting some old Oracle stuff to MS SQL Server and Oracle has multi-parameter subqueries and I'm trying to figure out how to do this in MS SQL Server. I'm not very familiar with the Oracle syntax and I'm having difficulty figuring out how to convert it. , I would use "EXISTS" instead of "IN":
code :
and exists (
  select 1 
  from (select tax_code, max(effect_date) effect_date
         from   v_txtaxrate
         where  effect_date <= '10-JAN-14'
         group by tax_code) a
  where rate.tax_code = a.tax_code
    and rate.effect_date = a.effect_date
)
Declare a BIT variable and set it as a Subquery in SQL Oracle Developer

Declare a BIT variable and set it as a Subquery in SQL Oracle Developer


By : gbread
Date : March 29 2020, 07:55 AM
hop of those help? You need something like the following. First, Oracle doesn't allow @ signs for variable names. It also doesn't have a BIT datatype (although PL/SQL will allow a BOOLEAN). You also can't insert a column value of any type into a BOOLEAN variable.
code :
DECLARE
  HasntPassedCourse BOOLEAN;
  v_cnt NUMBER;
BEGIN
  HasntPassedCourse := FALSE;
  SELECT COUNT(*) INTO v_cnt FROM dual;
  IF v_cnt != 0 THEN
    HasntPassedCourse := TRUE;
  END IF;
END;
/
DECLARE
  HasntPassedCourse NUMBER;
BEGIN
  SELECT COUNT(*) INTO HasntPassedCourse FROM <your query here>;
END;
/
DECLARE
  HasntPassedCourse NUMBER;
BEGIN
  SELECT COUNT(*) INTO HasntPassedCourse FROM PassedCourses P
   WHERE P.code != :newline.code AND P.cid != :newline.cid
     AND rownum = 1;
END;
/
Oracle - Second level subquery cannot see field from main query

Oracle - Second level subquery cannot see field from main query


By : Cory Crowe
Date : March 29 2020, 07:55 AM
will help you In Oracle 12c the following query works, but not in Oracle 11g, because second level subquery cannot see field from main query. , Maybe you only need a max in your nested query:
code :
SELECT   lvl, 
         unique_code, 
         (
            SELECT   max(p.unique_code)
                        FROM     tree p
                        WHERE    p.lvl = t.lvl - 1
                             AND p.unique_code < t.unique_code
         ) AS parent_unique_code FROM     tree t
Msg 512, Level 16, State 1, Line 2 Subquery returned more than 1 value. This is not permitted when the subquery follows

Msg 512, Level 16, State 1, Line 2 Subquery returned more than 1 value. This is not permitted when the subquery follows


By : roropoh
Date : March 29 2020, 07:55 AM
will help you In your main where clause you have where c_no=( <> ). The inner subquery here must return a single result, otherwise that where-clause doesn't make sense.
So either restrict the subquery to a single result by using top 1 or by fixing it if logically it should only ever return a single result.
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