Mysql PHP查询选择

Question

I want to order desc some rows from mysql table by a numberic value .

Such as: SELECT * FROM table ORDER BY ABS(row1) DESC .

Table format:

ID | Type | Value

1 | 2 | 42

2 | 1 | 52

3 | 2 | 67

4 | 2 | 50

5 | 1 | 15

6 | 1 | 27

7 | 3 | 48

8 | 3 | 23

And i want to get the following result - to sort by value DESC but first show rows with type 2 and DESC and after that the type 1,3,4 (...) rows DESC:

ID | Type | Value

3 | 2 | 67

4 | 2 | 50

1 | 2 | 42

2 | 1 | 52

7 | 3 | 48

6 | 1 | 27

9 | 3 | 23

5 | 1 | 15

Answer 1

您可以按两个或多个字段排序

SELECT * FROM table ORDER BY ABS(row1), row2, row3 DESC

Answer 2

This is the order by you want:

order by `type` = 2 desc,
         value desc

The expression type = 2 returns a boolean value, which is equivalent to 1 when true and 0 when false. Your example doesn't have negative values, so I don't see a need for abs() .