“无法在全局ORDER子句中使用”与mysql排序

Question

我对此SQL查询有疑问：

(SELECT tb1.id,tb1.bdate,tb1.jumpCard,tb1.publicImage,tb1.lastlogin
FROM users AS tb1, online AS tb2
WHERE tb1.valid='1' AND tb1.sex='female' AND tb1.looking_for='male' AND tb1.id = tb2.member_id
ORDER BY tb1.publicImage) ORDER BY tb1.id DESC

由于某些原因我得到了：

Table 'tb1' from one of the SELECTs cannot be used in global ORDER clause

任何建议？

由于

Answer 1

它不起作用的原因是外部ORDER BY无法“看到”tb1 - 它会看到内部子查询的结果。因此，在语法正确的查询版本中，您只需ORDER BY id：

(SELECT tb1.id,tb1.bdate,tb1.jumpCard,tb1.publicImage,tb1.lastlogin
FROM users AS tb1, online AS tb2
WHERE tb1.valid='1' AND tb1.sex='female' AND tb1.looking_for='male' AND tb1.id = tb2.member_id
ORDER BY tb1.publicImage) ORDER BY id DESC

但是，正如其他人指出的那样，这可以更简单地写成由id

排序的单个查询

Answer 2

如果在select周围加上括号，那么内部表格将不会在

之外显示

SELECT tb1.id,tb1.bdate,tb1.jumpCard,tb1.publicImage,tb1.lastlogin
FROM users AS tb1, online AS tb2
WHERE tb1.valid='1' AND tb1.sex='female' AND tb1.looking_for='male' AND tb1.id = tb2.member_id
ORDER BY tb1.publicImage, tb1.id DESC

您可以在一个order by子句中指定多个列

Answer 3

在select语句后关闭括号时，第二个order by子句将失效。而是尝试在单个order by语句中按列合并您的订单，如下所示：

SELECT tb1.id,tb1.bdate,tb1.jumpCard,tb1.publicImage,tb1.lastlogin
FROM users AS tb1, online AS tb2
WHERE tb1.valid='1' AND tb1.sex='female' AND tb1.looking_for='male' AND tb1.id = tb2.member_id
ORDER BY tb1.publicImage, tb1.id DESC