如何有两个条件选择

Question

我需要与工会有两个条件，选择从表中的数据，从表中的数据，或者任何用于表

name  special 

    Deepak   s 
    mukesh   v 
    dinesh   s 
    girgesh  v 
    Deepak   s 
    mukesh   v 
    dinesh   s 
    girgesh  v 
    Deepak   s 
    mukesh   v 
    dinesh   s 
    girgesh  v 

查询获取数据...

SELECT NAME FROM student WHERE special = "s" LIMIT 2 
UNION 
SELECT NAME FROM student WHERE special = "v" LIMIT 2 

但它在联合之前只给出第一个条件... 如何从单个表中获取两个不同的条件数据

Answer 1

每个MySQL's documentation on UNION：

通过或LIMIT应用于为了将个人选择，将子句封闭SELECT

---

括号内所以，你想使用：

(SELECT NAME FROM student WHERE special = "s" LIMIT 2) 
UNION 
(SELECT NAME FROM student WHERE special = "v" LIMIT 2) 

Answer 2

正如@Burned Buffen在评论中提到的：

SELECT NAME FROM student WHERE special = "s" or special = "v" LIMIT 2