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Asked: 2026-05-11T15:30:48+00:00

I have these two tables: CREATE TABLE x ( id INT NOT NULL, exclude

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I have these two tables:

CREATE TABLE x (     id INT NOT NULL,     exclude BIT NOT NULL,     PRIMARY KEY (id) );  CREATE TABLE y (     id INT NOT NULL,     field1 INT NOT NULL,     field2 INT NOT NULL,     field3 INT NOT NULL,     field4 INT NOT NULL,     field5 INT NOT NULL,     PRIMARY KEY (id) );

And this sproc:

CREATE PROCEDURE proc1 (     i1 INT,     i2 INT,     i3 INT,     i4 INT,     i5 INT ) BEGIN  SELECT     id FROM     y WHERE     field1 = i1,     field2 = i2,     field3 = i3,     field4 = i4,     field5 = i5     AND id NOT IN (         SELECT             y.id         FROM             y, x         WHERE             y.field1 = i1             AND y.field2 = i2,             AND y.field3 = i3,             AND y.field4 = i4,             AND y.field5 = i5             AND x.id = y.id             AND x.exclude = 1);  END IF;

I basically want to get the id field from y except those that exist in x with exclude = 1, can this be done with joins or written in a better way?

Many thanks

Note: The reason a join is used in the ‘NOT IN’ subquery is for performance sake, table x contains a lot of records while the select statement on table y returns only a couple of records

Edit: Also please note that the id in y might or might not exist in x (otherwise a simple join will do), I want all the ids in y except those that exist in x with exclude = 1

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1 Answer

  1. I’m not sure I follow your logic for using a join inside your subquery. You’re doing the same work twice.

    You could try:

    SELECT id FROM y WHERE field1 = 2 AND field2 = 3 AND field3 = 4 AND field4 = 5 AND field5 = 6 AND NOT EXISTS( SELECT x.id FROM x WHERE x.id = y.id AND x.exclude = 1 )
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