MySQL numeric operators and functions
For ordinary addition and subtraction operations, we will not explain them in detail here, as shown in the following example:
mysql> SELECT 3+4; +-----+ | 3+4 | +-----+ | 7 | +-----+ 1 row in set (0.03 sec)
CEIL and FLOOR
CEIL is rounded up, as long as there are decimal places , no matter how many, enter one directly. For example:
mysql> SELECT CEIL(3.01); +------------+ | CEIL(3.01) | +------------+ | 4 | +------------+ 1 row in set (0.02 sec)
FLOOR is the opposite of
mysql> SELECT FLOOR(3.99); +-------------+ | FLOOR(3.99) | +-------------+ | 3 | +-------------+ 1 row in set (0.00 sec）
p and MOD
p is rounded, MOD is remainder
mysql> SELECT 3/4; +--------+ | 3/4 | +--------+ | 0.7500 | +--------+ 1 row in set (0.00 sec) mysql> SELECT 3 p 4; +---------+ | 3 p 4 | +---------+ | 0 | +---------+ 1 row in set (0.00 sec) mysql> SELECT 3 MOD 4; +---------+ | 3 MOD 4 | +---------+ | 3 | +---------+ 1 row in set (0.00 sec)
Note: MOD can be replaced by %
POWER exponentiation
For example, 3 to the 2nd power
mysql> SELECT POWER(3,2); +------------+ | POWER(3,2) | +------------+ | 9 | +------------+ 1 row in set (0.14 sec)
ROUNDRounding
For example, 3.652 is rounded to two decimal places.
mysql> SELECT ROUND(3.652,2); +----------------+ | ROUND(3.652,2) | +----------------+ | 3.65 | +----------------+ 1 row in set (0.00 sec)
Retain one decimal place:
mysql> SELECT ROUND(3.652,1); +----------------+ | ROUND(3.652,1) | +----------------+ | 3.7 | +----------------+ 1 row in set (0.00 sec)
##TRUNCATE
Remove certain digits directly
mysql> SELECT TRUNCATE(125.89,2); +--------------------+ | TRUNCATE(125.89,2) | +--------------------+ | 125.89 | +--------------------+ 1 row in set (0.00 sec) mysql> SELECT TRUNCATE(125.89,1); +--------------------+ | TRUNCATE(125.89,1) | +--------------------+ | 125.8 | +--------------------+ 1 row in set (0.00 sec) mysql> SELECT TRUNCATE(125.89,0); +--------------------+ | TRUNCATE(125.89,0) | +--------------------+ | 125 | +--------------------+ 1 row in set (0.00 sec) mysql> SELECT TRUNCATE(125.89,-1); +---------------------+ | TRUNCATE(125.89,-1) | +---------------------+ | 120 | +---------------------+ 1 row in set (0.00 sec)
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