MariaDB比較運算符

MongoDB比較運算符用於測試等於或不等於,還有其它更高級的運算符。

WHERE子句中使用比較運算符來確定要選擇的記錄。以下是可以在MariaDB中使用的比較運算符的列表:

語法及示例 -

編號

比較運算符

描述

示例

1

=

比較等於

select * from students where id=100

2

<=>

比較等於(安全比較NULL值)

select * from students where student_name<=>'Maxsu'

3

<>

比較不等於

select * from students where student_name<>'Maxsu'

4

!=

比較不等於

select * from students where student_name!='Maxsu'

5

>

比較大於

select * from students where student_id>5

6

>=

比較大於或等於

select * from students where student_id>=5

7

<

比較小於

select * from students where student_id<5

8

<=

比較小於或等於

select * from students where student_id<=5

9

in ( )

匹配列表中的值

select * from students where student_id IN(1,3,6)

10

not

否定一個條件

select * from students where student_id NOT IN(1,3,6)

11

between

匹配在一個範圍內(含)

select * from students where student_id between 1 AND 3)

12

is null

判斷是否爲NULL

select * from students where student_address IS NULL

13

is not null

判斷是否爲非NULL

select * from students where student_address IS NOT NULL

14

like

%_模式匹配

select * from students where student_name LIKE 'Ma%'

15

exists

如果子查詢返回至少一行,則滿足條件。

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