PHP在多表同一列中收集mysql结果

Question

我将数据库分为4个表。 每个都是相同的结构。

    $sql = "SELECT * FROM `dba` WHERE domain>= (SELECT FLOOR( MAX(domain) * RAND()) FROM `dba` ) ORDER BY domain LIMIT 1";
    $result = mysql_query($sql);
    while($list = mysql_fetch_array($result)){
    $domain = $list["domain"];
    echo $domain;
    }

现在sql_query的结果仅返回一行。 我如何显示所有从4表。 谢谢

Answer 1

使用UNION

SELECT * FROM `dba` WHERE domain>= (SELECT FLOOR( MAX(domain) * RAND()) FROM `dba` ) ORDER BY domain LIMIT 1
UNION 
SELECT * FROM `dbb` WHERE domain>= (SELECT FLOOR( MAX(domain) * RAND()) FROM `dbb` ) ORDER BY domain LIMIT 1
UNION
SELECT * FROM `dbc` WHERE domain>= (SELECT FLOOR( MAX(domain) * RAND()) FROM `dbc` ) ORDER BY domain LIMIT 1
UNION
SELECT * FROM `dbd` WHERE domain>= (SELECT FLOOR( MAX(domain) * RAND()) FROM `dbd` ) ORDER BY domain LIMIT 1