，SELECT * FROM 表1 WHERE 字段1 IN (SELECT 字段2 FROM 表2)，``，SELECT * FROM 表1 WHERE 字段1 IN (SELECT 字段2 FROM 表2)，``php，$result = mysqli_query($conn, "SELECT * FROM table");，$data = mysqli_fetch_all($result, MYSQLI_ASSOC);，echo json_encode($data);，``sql，SELECT a.*, b.*，FROM table1 a，JOIN table2 b ON a.id = b.a_id;，``，，这条语句将table1和table2通过a.id和b.a_id进行关联查询。Powered By Z-BlogPHP 1.7.3
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