MySQL插入无效日期

Question

再说一次，这个qn是mysql认证指南书上的练习qns...

问题

Here's the structure of a table typetest with three columns (number, string, and dates). As- sume the server is running in MySQL's “forgiving” SQL mode.

mysql> DESCRIBE typetest;
+--------+---------------------+------+-----+---------+-------+
| Field | Type  | Null | Key | Default | Extra |
+--------+---------------------+------+-----+---------+-------+
| number | tinyint(3) unsigned | YES    |   | NULL  |   |
+--------+---------------------+------+-----+---------+-------+

You perform the following INSERT operation on table typetest:

INSERT INTO typetest VALUES (1000,'yoodoo','999-12-31');

What data values will actually be stored in the table? Provide a short explanation. 

回答

+--------+--------+------------+
| number | string | dates   |
+--------+--------+------------+
|   255 | yoodo | 0000-00-00 |
+--------+--------+------------+

The inserted number 1000 is too big to fit in the TINYINT UNSIGNED column, so the highest pos- sible value (255) is inserted. 'yoodoo' is too long for a CHAR(5) column and is thus truncated to five  characters.  '999-12-31' is  a  date  that  is  earlier  than  the  earliest  possible  DATE value ('1000-01-01'). This is interpreted as an invalid date, so the “zero” date is stored.

当我尝试将“999-12-31”插入日期时，我得到了 0999-12-31。我在认证指南的某些地方读到 mysql 可能能够插入 1000-01-01 到 9999-12-31 范围之外的日期。但是在考试中我要回答什么？

Answer 1

您可以阅读 Constraints on Invalid Data部分。不幸的是，它不能直接回答您的问题。它说“如果日期完全错误(服务器无法存储它)，特殊的“零”日期值'0000-00-00'将存储在列中。”，我会说存储 0999 不是'不可能...