$sql = 'SELECT 
        * 
      FROM 
        `vvt_spread_doubleegg_exchange_award` AS p
      WHERE
        p.`act_type` = 4 or p.`act_type` = 5
      AND
        p.`user_id` = ' .$user_id
      ;

sql中的or語法一般用于多個(gè)條件的查詢，上面的語法查詢的相當(dāng)于：兩個(gè)sql查詢出來的數(shù)據(jù)集合。

 $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;

2. 要想查詢act_type = 4 and user_id = 11123 或者等于 p.`act_type` = 5 and user_id = 11123的數(shù)據(jù)集合 or兩邊的條件一定要加（）。

$sql = 'SELECT 
        * 
      FROM 
        `vvt_spread_doubleegg_exchange_award` AS p
      WHERE
        （p.`act_type` = 4 or p.`act_type` = 5）
      AND
        p.`user_id` = ' .$user_id
      ;

看完以上示例介紹后大家學(xué)會(huì)了嗎？趕緊動(dòng)手嘗試一下吧。

相關(guān)推薦：

php foreach與for語句用法區(qū)別介紹_PHP教程

jQuery使用each方法與for語句遍歷數(shù)組示例

mysql中order by in 的字符順序(推薦)

以上就是MySQL中or語句用法示例的詳細(xì)內(nèi)容，更多請(qǐng)關(guān)注php中文網(wǎng)其它相關(guān)文章！