多条件引用子查询

Question

我有一个 table 叫 employees:

id     |    name    |    born    |    stinky
-------------------------------------------------
1          Chris        1982            1
2          Chris        1982            1
3           Bob         1982            0
4          Chris        1982            1

我想根据以下条件抓取第 2、4 行：

SELECT 
    id,name,born,stinky
FROM
    employees
WHERE
    name=(SELECT name FROM employees WHERE id=1)
        AND
    born=(SELECT born FROM employees WHERE id=1)
        AND
    stinky=(SELECT stinky FROM employees WHERE id=1)
        AND
    id != 1

有没有办法优化到只执行一个子查询，然后多次引用子查询数据？例如，像这样：

SELECT 
    id,name,born,stinky
FROM
    employees
SUBQUERY
    (SELECT name FROM employees WHERE id=1) AS XX
WHERE
    name=XX.name
        AND
    born=XX.born
        AND
    stinky=XX.stinky
        AND
    id != 1

Answer 1

您只能使用一次子查询：

SELECT id,name,born,stinky
FROM employees
WHERE (name,born,stinky) = (SELECT name,born,stinky FROM employees WHERE id=1)
  AND id <> 1

另一种方法是使用连接：

SELECT e.id,e.name,e.born,e.stinky
FROM employees e
INNER JOIN (SELECT * FROM employees WHERE id=1) t
ON (t.name,t.born,t.stinky) = (e.name,e.born,e.stinky) AND t.id <> e.id

参见demo。
结果：

id	name	born	stinky
2	Chris	1982	1
4	Chris	1982	1

多条件引用子查询

Referencing sub-query in multiple conditions

mysql

sql

subquery