SQL ORDER BY 多个字段与子订单

Question

我正在尝试查询以获取按定义的类型、性别和姓名排序的学生 class 的列表。

我有下一个问题：

SELECT * FROM STUDENTS
  ORDER BY FIELD(type, 'b', 'p', 'j', 'i', 'a', 'c', 'v'), FIELD(sex, 'M', 'F'), `name` ASC

我得到了那个顺序，首先是类型，然后是那个类型和名称的性别，但我需要一起定义一些类型和性别，就像这样：

type = 'b', sex = 'M', name
type = 'b', sex = 'F', name
type = 'p', sex = 'M', name
type = 'p', sex = 'F', name
type = 'i', sex = 'M', name
type = 'a', sex = 'M', name
type = 'c', sex = 'M', name
type = 'v', sex = 'M', name
type = 'j', sex = 'M', name
type = 'i', sex = 'F', name
type = 'a', sex = 'F', name
type = 'c', sex = 'F', name
type = 'v', sex = 'F', name
type = 'j', sex = 'F', name

Answer 1

您始终可以使用 CASE 语句来创建您想要的表达式

SQL DEMO

SELECT *
FROM Table1
ORDER BY CASE WHEN type = 'b' and sex = 'M' THEN 1
              WHEN type = 'b' and sex = 'F' THEN 2
              WHEN type = 'p' and sex = 'M' THEN 3
              WHEN type = 'p' and sex = 'F' THEN 4
              ....
              ELSE 9999
          END,
          name

SQL ORDER BY 多个字段与子订单

SQL ORDER BY multiple fields with sub orders

mysql

sql

doctrine-orm

dbal