MySQL basic study notes-operators in MySQL

Operators in MySQL

1. Arithmetic operators

Operator	Description
+	addition
-	Subtraction
*	multiplication
/，DIV	Division, return quotient
%，MOD	Division, return remainder

mysql> select 0.1+0.3333,1.0-0.3333,0.1*0.3333,1/2,1%2,1/0,100%0,MOD(3,2);
+------------+------------+------------+--------+------+------+-------+----------+
| 0.1+0.3333 | 1.0-0.3333 | 0.1*0.3333 | 1/2    | 1%2  | 1/0  | 100%0 | MOD(3,2) |
+------------+------------+------------+--------+------+------+-------+----------+
|     0.4333 |     0.6667 |    0.03333 | 0.5000 |    1 | NULL |  NULL |        1 |
+------------+------------+------------+--------+------+------+-------+----------+
1 row in set, 2 warnings (0.00 sec)

The divisor is 0 and returns NULL; the MOD() function has the same effect as the remainder of the operator %.

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2. Comparison operators

Comparison operator	Description
=	equal
<> or !=	not equal to
<=>	NULL safe equals
<=	Less than or equal to
<	Less than
>	more than the
>=	greater or equal to
BETWEEN	Exists in the specified range
IN	Exists in the specified collection
IS NULL	Is NULL
IS NOT NULL	Not NULL
LIKE	Wildcard matching
REGEXP or RLIKE	Regular expression matching

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3. Logical operators

Logical Operators	Description
NOT or!	Logical negation
AND 或 &&	Logical and
OR 或 ||	Logical OR
XOR	Logical exclusive OR

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4. Bitwise operator

Bit operator	Description
&	Bit and
|	Bit or
^	Bit XOR
~	Bit inversion
>>	Bit shift right
<<	Bit shift left