Hi,
can someone could explain where are problems in this query:
EXPLAIN
SELECT ID
FROM ven_tes
WHERE ID IN (SELECT ID FROM ven_tes WHERE ID_ven=6573)
+----+--------------------+---------+-----------------+----------------+---------+---------+------+------+--------------------------+
| id | select_type | table | type | possible_keys |
key | key_len | ref | rows | Extra |
+----+--------------------+---------+-----------------+----------------+---------+---------+------+------+--------------------------+
| 1 | PRIMARY | ven_tes | index | NULL |
PRIMARY | 4 | NULL | 6573 | Using where; Using index |
| 2 | DEPENDENT SUBQUERY | ven_tes | unique_subquery | PRIMARY,ID_ven |
PRIMARY | 4 | func | 1 | Using index; Using where |
+----+--------------------+---------+-----------------+----------------+---------+---------+------+------+--------------------------+
as you can see, it doesn't use absolutely indexes on ven_tes (ID is the
primary key, ID_ven is index)
Thanks in advance
Carlo
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