我试图计算以下三个结果的总和,但我只计算一个结果.
$sql = "(SELECT COUNT(*) FROM table1 WHERE somecondition)
UNION
(SELECT COUNT(*) FROM table2 WHERE somecondition)
UNION
(SELECT COUNT(*) FROM table3 WHERE somecondition)";
任何人都可以帮忙.谢谢