add MySQL compatibility in user-defined-variables.md (#6062) (#6137)

pingcap · Apr 25, 2021 · a1b755c · a1b755c
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commit a1b755c
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diff --git a/user-defined-variables.md b/user-defined-variables.md
@@ -178,4 +178,8 @@ SELECT @col FROM t;
 +------+
 ```
 
+## MySQL 兼容性
+
+除 `SELECT ... INTO <variable>` 外，MySQL 和 TiDB 支持的语法相同。
+
 更多细节，请参考 [MySQL 文档](https://dev.mysql.com/doc/refman/5.7/en/user-variables.html)。