In this particular case, CASE might be better because it can use LIKE, which is better than SUBSTR which would negate the use of an index.

Though, specifying LIKE for each option might work against that, so its hard to tell.

CASE
 WHEN te.TEAM_ID    LIKE 'MU%' THEN 'Manchester United'
 WHEN te.TEAM_ID    LIKE 'RM%' THEN 'Real Madrid'
END Team

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In reply to Re^3: Mocked query returns wrong result by chacham
in thread Mocked query returns wrong result by Anonymous Monk

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