Question

I have a variable called c_kilometers. I have a cursor that grabs a bunch of records that have those kilometers. I need to run two separate SELECT statements in the cursor that simply grab a kilometer from one table based on values in the cursor, and run another SELECT doing the same thing on another table.

SELECT t.kilometers INTO c_kilometers FROM table_name WHERE WHERE l.code = cursor_t.code_att  SELECT g.kilometers INTO c_kilometers FROM table_name WHERE l.code = cursor_t.code_aff 

My question is can I add the c_kilometers together without creating a temporary variable to hold on of the values? I haven’t used PL/SQL in awhile, and I don’t remember having to do this ever, so this is more of a learning question than anything.

Answer 1

Provided that both your queries always return exactly one row, you can do either of the following:

/* Variant 1 */   SELECT  t.kilometers + g.kilometers INTO    c_kilometers FROM    table_name t, table_name2 g WHERE   etc1         AND etc2  /* Variant 2 */  SELECT  t.kilometers INTO    c_kilometers FROM    table_name WHERE   etc;  SELECT  c_kilometers + g.kilometers INTO    c_kilometers FROM    table_name2 WHERE   etc; 

If they’re in the same table as you posted, you can use:

SELECT COALESCE(SUM(kilometers), 0) INTO   c_kilometers FROM   table_name WHERE  l.code IN (cursor_t.code_aff, cursor_t.code_att) 

It seems that it will be more efficient to put table_name into your SELECT query that produces the cursor.

If you post this query, I’ll probably can help to do this.