php，$sql = "SELECT a.*, b.* FROM table1 a JOIN table2 b ON a.id = b.a_id";，$result = $conn>query($sql);，``，，这段代码将table1和table2通过a.id和b.a_id进行连接，并选择所有字段。php，$sql = "SELECT a.*, b.* FROM table1 a JOIN table2 b ON a.id = b.a_id";，$result = $conn>query($sql);，``，，这段代码将table1和table2通过a.id和b.a_id进行连接，并选择所有字段。JOIN 子句来查询两个表的数据。，，``sql，SELECT a.column1, b.column2，FROM table1 a，JOIN table2 b ON a.common_column = b.common_column;，``，，这段 SQL 语句将返回两个表中匹配的记录。sql，SELECT a.column1, b.column2，FROM table1 a，JOIN table2 b ON a.id = b.id;，``，，这段SQL代码会从table1和table2中查询数据，并将结果合并在一起。Powered By Z-BlogPHP 1.7.3
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