如何从两个条件的表中选择数据

Question

I need to select data from table with two condition with union or if any for table

    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

query for fetching data...

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

but its gives only first condition before union... how to get two different condition data from single table

Answer 1

Per MySQL's documentation on UNION :

To apply ORDER BY or LIMIT to an individual SELECT, place the clause inside the parentheses that enclose the SELECT

---

So you'd want to use:

(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