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Rechercher dans le manuel MySQL
3.6.7 Searching on Two Keys
An OR
using a single key is well
optimized, as is the handling of
AND
.
The one tricky case is that of searching on two different keys
combined with OR
:
This case is optimized. See Section 8.2.1.3, “Index Merge Optimization”.
You can also solve the problem efficiently by using a
UNION
that combines the output of
two separate SELECT
statements.
See Section 13.2.10.3, “UNION Syntax”.
Each SELECT
searches only one key
and can be optimized:
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Steph