如何使MYSQL查询结果ORDER BY条件顺序？

Question

我的查询字符串如下:

SELECT ... FROM maintable
LEFT JOIN table1 on (maintable.id = table1.idx)
LEFT JOIN table2 on (table1.idy = table2.idy)
LEFT JOIN table3 on (table2.idz = table3.idz)
WHERE (condition1 OR condition2 OR condition3)
AND maintable.status = static

//condition1 & condition2 & condition3 are kind of
table3.idz = 101, table3.idz = 3, maintable.id IN (1,2,3,4), and so on

对于结果,我希望condition1首先返回满足的条目,然后是满足的condition2条目,最后是满足的条目condition3.有任何想法吗？

Answer 1

要按照您想要的顺序进行排序,请在ORDER BY中使用您的条件,但DESC在它们之后使用.

SELECT *
FROM person
WHERE (condition1 OR condition2 OR condition3)
AND maintable.status = static
ORDER BY
    condition1 DESC,
    condition2 DESC,
    condition3 DESC

如果这不起作用,因为您的查询更复杂,那么您可以使用布尔逻辑将您的查询更改(A OR B OR C) AND D为(A AND D) OR (B AND D) OR (C AND D)然后您可以使用以下查询:

SELECT *
FROM person
WHERE (condition1 OR condition2 OR condition3)
AND maintable.status = static
ORDER BY
    condition1 AND static DESC,
    condition2 AND static DESC,
    condition3 AND static DESC

在AND static这里是没有必要的,因为所有的行返回,但在更复杂的例子(在这里你也可以返回一些行这不是静态的),那么你就必须这样做,在这种方式.

Answer 2

这应该工作:

ORDER BY condition1, condition2, condition3

例如

ORDER BY (weight > 500), (height > 3), (height < 2)