Question

I have a table with primary key (ColumnA, ColumnB). I want to make a function or procedure that when passed two integers will insert a row into the table but make sure the largest integer always goes into ColumnA and the smaller one into ColumnB.

So if we have SetKeysWithTheseNumbers(17, 19) would return

|-----------------|
|ColumnA | ColumnB|
|-----------------|
|19      | 17     |
|-----------------|

SetKeysWithTheseNumbers(19, 17) would return the same thing

|-----------------|
|ColumnA | ColumnB|
|-----------------|
|19      | 17     |
|-----------------|

Answer 1

Use:

INSERT INTO your_table
  (COLUMN_A, COLUMN_B)
VALUES(GREATEST(@param_a, @param_b), 
       LEAST(@param_a, @param_b))

Reference:

• GREATEST
• LEAST