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mysql-compatibility: update ZERO_DATE docs (#5154) #5233

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Dec 31, 2020
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mysql-compatibility: update ZERO_DATE docs (#5154) #5233

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6 changes: 0 additions & 6 deletions mysql-compatibility.md
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Expand Up @@ -174,12 +174,6 @@ TiDB 支持大部分 [SQL 模式](/sql-mode.md)。不支持的 SQL 模式如下

- MySQL 默认使用本地时区，依赖于系统内置的当前的时区规则（例如什么时候开始夏令时等）进行计算；且在未[导入时区表数据](https://dev.mysql.com/doc/refman/8.0/en/time-zone-support.html#time-zone-installation)的情况下不能通过时区名称来指定时区。

#### 零月和零日

- 与 MySQL 一样，TiDB 默认启用了 `NO_ZERO_DATE` 和 `NO_ZERO_IN_DATE` 模式，但是 TiDB 与 MySQL 在处理这两个 SQL 模式有以下不同：
- TiDB 在非严格模式下启用以上两个 SQL 模式，插入零月/零日/零日期不会给出警告，MySQL 则会给出对应的警告。
- TiDB 在严格模式下，启用了 `NO_ZERO_DATE`，仍然能够插入零日期；如果启用了 `NO_ZERO_IN_DATE` 则无法插入零月/零日日期。MySQL 在严格模式下则都无法插入两种类型的日期。

### 类型系统

+ 不支持 FLOAT4/FLOAT8。
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