Shulou(Shulou.com)06/01 Report--

The following mainly brings you the use of or sentences in MySQL. I hope these words can bring you practical use, which is also the main purpose of this article when I edit the use of or sentences in MySQL. All right, don't talk too much nonsense, let's just read the following.

$sql = 'SELECT * FROM `vvt_spread_doubleegg_exchange_ award` AS p WHERE p.`act _ type` = 4 or p.`act _ type` = 5 AND p.`user _ id` ='. $user_id

The or syntax in sql is generally used for queries with multiple conditions, and the above syntax query is equivalent to: two sets of data queried by sql.

$sql = 'SELECT * FROM `vvt_spread_doubleegg_exchange_ award` AS p WHERE p.`act _ type` = 4; $sql =' SELECT * FROM `vvt_spread_doubleegg_exchange_ award`AS p WHERE p.`act _ type` = 5 AND p.`user _ id` ='. $user_id

two。 To query the data set act_type = 4 and user_id = 11123 or equal to p.`act _ type` = 5 and user_id = 11123, the conditions on both sides of the or must be added ().

$sql = 'SELECT * FROM `vvt_spread_doubleegg_exchange_ award` AS p WHERE (p.`act _ type` = 4 or p.`act _ type` = 5) AND p.`user _ id` ='. $user_id

For the above about the use of or statements in MySQL, we do not think it is very helpful. If you need to know more, please continue to follow our industry information. I'm sure you'll like it.

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