我只想知道在 MySQL
中为 INT
DataType 定义 ZEROFILL
的好处/用途是什么?
I just want to know what is the benefit/usage of defining ZEROFILL
for INT
DataType in MySQL
?
`id` INT UNSIGNED ZEROFILL NOT NULL
当您选择类型为 ZEROFILL
的列时,它会用零填充字段的显示值,直至在列定义.长于显示宽度的值不会被截断.请注意,ZEROFILL
的使用也意味着 UNSIGNED
.
When you select a column with type ZEROFILL
it pads the displayed value of the field with zeros up to the display width specified in the column definition. Values longer than the display width are not truncated. Note that usage of ZEROFILL
also implies UNSIGNED
.
使用 ZEROFILL
和显示宽度对数据的存储方式没有影响.它只影响它的显示方式.
Using ZEROFILL
and a display width has no effect on how the data is stored. It affects only how it is displayed.
以下是一些示例 SQL,演示了 ZEROFILL
的使用:
Here is some example SQL that demonstrates the use of ZEROFILL
:
CREATE TABLE yourtable (x INT(8) ZEROFILL NOT NULL, y INT(8) NOT NULL);
INSERT INTO yourtable (x,y) VALUES
(1, 1),
(12, 12),
(123, 123),
(123456789, 123456789);
SELECT x, y FROM yourtable;
结果:
x y
00000001 1
00000012 12
00000123 123
123456789 123456789
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