如何有兩個條件選擇

Question

我需要與工會有兩個條件，選擇從表中的數據，從表中的數據，或者任何用於表

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 

查詢獲取數據...

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

但它在聯合之前只給出第一個條件... 如何從單個表中獲取兩個不同的條件數據

Answer 1

每個MySQL's documentation on UNION：

通過或LIMIT應用於爲了將個人選擇，將子句封閉SELECT

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括號內所以，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在評論中提到的：

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