如何在一个查询中完成多个查询

Question

如何在一个查询中完成以下查询，并按照下面的方式获得结果？

// Begining of January

$ob = mysql_query(" SELECT SUM(salary_amount) AS total FROM teacherexpense WHERE  month(disburse_date)='01' AND  year(disburse_date)='$year' ");
$nt = mysql_fetch_assoc($ob);
$salaryamount= $nt['total'];


$ob = mysql_query(" SELECT SUM(other_expense_amount) AS expenseamount FROM otherexpense WHERE month(other_expense_date)='01' AND year(other_expense_date)='$year'  ");
$nt = mysql_fetch_assoc($ob);
$expenseamount= $nt['expenseamount'];

$jk = mysql_query(" SELECT SUM(amountpaid) AS revenue FROM studentpayment1 WHERE month(received_date)='01' AND year(received_date)='$year' ");
$t = mysql_fetch_assoc($jk);
$revenue= $t['revenue'];

$ob = mysql_query(" SELECT SUM(other_earning_amount) AS otherearningamount FROM otherearning WHERE month(other_earning_date)='01' AND year(other_earning_date)='$year' ");
$nt = mysql_fetch_assoc($ob);
$otherearningamount= $nt['otherearningamount'];


$January= ($revenue+$otherearningamount)-($salaryamount+$expenseamount);
// End of January

Answer 1

在存储过程中填充它？ PHP的数据库驱动程序不允许您运行多个以;分隔的查询;出于安全考虑。

Answer 2

您是否尝试过mysqli驱动程序而不是mysql？

看看：mysqli_multi_query

执行一个或多个以分号连接的查询。

Answer 3

SELECT 'withdrawals' t, SUM( amount ) sum
FROM withdrawals
UNION
SELECT 'statement' t, SUM( amount ) sum
FROM statement

while($row = mysql_fetch_assoc($result))
{
    $total[$row['t']] = $row['sum'];
}

echo $total['withdrawals']; # 100
echo $total['statement']; # 624.x

Answer 4

您可以使用MySQL UNION - 但您必须迭代结果集，因为在这种情况下您将获得4条记录而不是一条/语句组