MySQL中如何将数字格式化为小数点后两位？

您可以使用MySQL的TRUNCATE()函数将数字格式化为2位小数。语法如下：

SELECT TRUNCATE(yourColumnName,2) as anyVariableName from yourTableName;

为了理解上面的语法，让我们首先创建一个表。创建表的查询如下 -

mysql> create table FormatNumberTwoDecimalPlace
   -> (
   -> Number float
   -> );
Query OK, 0 rows affected (0.59 sec)

使用插入命令在表中插入一些记录。查询如下所示 −

mysql> insert into FormatNumberTwoDecimalPlace values(123.456);
Query OK, 1 row affected (0.13 sec)

mysql> insert into FormatNumberTwoDecimalPlace values(1.6789);
Query OK, 1 row affected (0.19 sec)

mysql> insert into FormatNumberTwoDecimalPlace values(12.2);
Query OK, 1 row affected (0.14 sec)

mysql> insert into FormatNumberTwoDecimalPlace values(12356.23145);
Query OK, 1 row affected (0.40 sec)

mysql> insert into FormatNumberTwoDecimalPlace values(12356);
Query OK, 1 row affected (0.14 sec)

mysql> insert into FormatNumberTwoDecimalPlace values(.5678);
Query OK, 1 row affected (0.28 sec)

让我们现在使用select命令显示表中的所有记录。查询如下所示−

mysql> select *from FormatNumberTwoDecimalPlace;

输出

+---------+
| Number  |
+---------+
| 123.456 |
|  1.6789 |
|    12.2 |
| 12356.2 |
|   12356 |
|  0.5678 |
+---------+
6 rows in set (0.04 sec)

这是将数字格式化为两位小数的查询 -

mysql> select truncate(Number,2) as TwoValueAfterDecimal from
FormatNumberTwoDecimalPlace;

输出

+----------------------+
| TwoValueAfterDecimal |
+----------------------+
|               123.45 |
|                 1.67 |
|                12.19 |
|             12356.23 |
|             12356.00 |
|                 0.56 |
+----------------------+
6 rows in set (0.00 sec)

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