MySQL數值運算子和函數

對於普通加減法運算，此處不予詳細講解，如下例：

mysql> SELECT 3+4;
+-----+
| 3+4 |
+-----+
|   7 |
+-----+
1 row in set (0.03 sec)

CEIL和FLOOR

#CEIL為向上取整，只要有小數位，不管是幾，直接入一位。例如：

mysql> SELECT CEIL(3.01);
+------------+
| CEIL(3.01) |
+------------+
|          4 |
+------------+
1 row in set (0.02 sec)

FLOOR與此

相反

mysql> SELECT FLOOR(3.99);
+-------------+
| FLOOR(3.99) |
+-------------+
|           3 |
+-------------+
1 row in set (0.00 sec）

############################## # #########p和MOD##################p為取整，MOD為取餘#########

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)

# ##註：MOD可以換成％############POWER冪運算#############例如3的2次方###

mysql> SELECT POWER(3,2);
+------------+
| POWER(3,2) |
+------------+
|          9 |
+------------+
1 row in set (0.14 sec)

#### #####ROUND四捨五入############例如3.652保留小數點後兩位。 ###

mysql> SELECT ROUND(3.652,2);
+----------------+
| ROUND(3.652,2) |
+----------------+
|           3.65 |
+----------------+
1 row in set (0.00 sec)

###保留小數點後面一位：###

mysql> SELECT ROUND(3.652,1);
+----------------+
| ROUND(3.652,1) |
+----------------+
|            3.7 |
+----------------+
1 row in set (0.00 sec)

##################TRUNCATE############################################################ #直接去掉某幾位######

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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