Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

sql: Default changes from TIDB master #771

Closed
wants to merge 7 commits into from
Closed

sql: Default changes from TIDB master #771

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
7 commits
Select commit Hold shift + click to select a range
9eec56a
Change sql-mode to same as MySQL
morgo Nov 20, 2018
ba2300b
Update mysql-compatibility.md
morgo Nov 20, 2018
3699019
Update character-set-configuration.md
morgo Nov 20, 2018
25a933a
Improve character set description
morgo Nov 20, 2018
0bea66b
Update mysql-compatibility.md
morgo Nov 26, 2018
a5ce1a9
Update character-set-configuration.md
morgo Nov 26, 2018
de74ba9
Update sql/character-set-support.md
lilin90 Jan 14, 2019
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
2 changes: 1 addition & 1 deletion sql/character-set-configuration.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,6 @@ category: user guide

# Character Set Configuration

Currently, TiDB only supports the `utf8` character set, which is the equivalent to `utf8mb4` in MySQL. Since MySQL 5.7 defaults to `latin1`, this difference is documented under [default differences](../sql/mysql-compatibility.md#default-differences) between TiDB and MySQL.
Currently, TiDB only supports the `utf8mb4` character set. Since MySQL 5.7 defaults to `latin1`, this difference is documented under [default differences](../sql/mysql-compatibility.md#default-differences) between TiDB and MySQL.

For more information, see [Character Set Configuration in MySQL](https://dev.mysql.com/doc/refman/5.7/en/charset-configuration.html).
4 changes: 2 additions & 2 deletions sql/character-set-support.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,7 @@ category: user guide

A character set is a set of symbols and encodings. A collation is a set of rules for comparing characters in a character set.

Currently, TiDB supports the following character sets:
For **compatibility reasons**, TiDB lists several character sets as available, but will always store data in the `utf8mb4` character set.

```sql
mysql> SHOW CHARACTER SET;
Expand All @@ -24,7 +24,7 @@ mysql> SHOW CHARACTER SET;
5 rows in set (0.00 sec)
```

> **Note**: In TiDB, utf8 is treated as utf8mb4.
> **Note**: All character sets are currently treated as utf8mb4.

Each character set has at least one collation. Most of the character sets have several collations. You can use the following statement to display the available character sets:

Expand Down
12 changes: 6 additions & 6 deletions sql/mysql-compatibility.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -22,7 +22,7 @@ However, in TiDB, the following MySQL features are not supported for the time be
+ `FOREIGN KEY` constraints
+ `FULLTEXT` functions and indexes
+ `SPATIAL` functions and indexes
+ Character sets other than `utf8`
+ Character sets other than `utf8mb4`
+ Collations other than `BINARY`
+ Add primary key
+ Drop primary key
Expand Down Expand Up @@ -160,7 +160,7 @@ mysql> SHOW CREATE TABLE t1\G
Table: t1
Create Table: CREATE TABLE `t1` (
`a` int(11) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
1 row in set (0.00 sec)
```

Expand All @@ -173,12 +173,12 @@ The output of the query execution plan returned from the `EXPLAIN` command diffe
### Default differences

- Default character set:
- The default value in TiDB is `utf8` which is equivalent to `utf8mb4` in MySQL.
- The default value in TiDB is `utf8mb4`.
- The default value in MySQL 5.7 is `latin1`, but changes to `utf8mb4` in MySQL 8.0.
- Default collation: `latin1_swedish_ci` in MySQL 5.7, while `binary` in TiDB.
- Default SQL mode:
- The default value in TiDB is `STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION`.
- The default value in MySQL 5.7 is `ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION`.
- Default value of `foreign_key_checks`:
- The default value in TiDB is `OFF` and currently TiDB only supports `OFF`.
- The default value in MySQL 5.7 is `ON`.
- Default value of `lower_case_table_names`:
- The default value in TiDB is 2 and currently TiDB only supports 2.
- The default value in MySQL:
Expand Down