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data-type-string: Corrections (#11155) #11256

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Nov 10, 2022
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data-type-string: Corrections (#11155) #11256

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data-type-string: Corrections
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10 changes: 5 additions & 5 deletions data-type-string.md
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Expand Up @@ -37,7 +37,7 @@ The space occupied by a single character might differ for different character se

### `TEXT` type

`TEXT` is a string of variable-length. M represents the maximum column length in characters, ranging from 0 to 65,535. The maximum row length and the character set being used determine the `TEXT` length.
`TEXT` is a string of variable-length. The maximum column length is 65,535 bytes. The optional M argument is in characters and is used to automatically select the fittest type of a `TEXT` column. For example `TEXT(60)` will yield a `TINYTEXT` data type that can hold up to 255 bytes, which fits a 60-character UTF-8 string that has up to 4 bytes per character (4×60=240). Using the M argument is not recommended.

```sql
TEXT[(M)] [CHARACTER SET charset_name] [COLLATE collation_name]
Expand All @@ -53,15 +53,15 @@ TINYTEXT [CHARACTER SET charset_name] [COLLATE collation_name]

### `MEDIUMTEXT` type

The `MEDIUMTEXT` type is similar to the [`TEXT` type](#text-type). The difference is that the maximum column length of `MEDIUMTEXT` is 16,777,215.
The `MEDIUMTEXT` type is similar to the [`TEXT` type](#text-type). The difference is that the maximum column length of `MEDIUMTEXT` is 16,777,215. But due to the [Limitation on a single column in TiDB](/tidb-limitations.md#limitation-on-a-single-column), the maximum storage size of a single column in TiDB is 6 MiB by default and can be increased to 120 MiB by changing the configuration.

```sql
MEDIUMTEXT [CHARACTER SET charset_name] [COLLATE collation_name]
```

### `LONGTEXT` type

The `LONGTEXT` type is similar to the [`TEXT` type](#text-type). The difference is that the maximum column length of `LONGTEXT` is 4,294,967,295. But due to the [Limitation on a single column in TiDB](/tidb-limitations.md#limitation-on-a-single-column), the maximum storage size of a single column in TiDB is 6 MB.
The `LONGTEXT` type is similar to the [`TEXT` type](#text-type). The difference is that the maximum column length of `LONGTEXT` is 4,294,967,295. But due to the [Limitation on a single column in TiDB](/tidb-limitations.md#limitation-on-a-single-column), the maximum storage size of a single column in TiDB is 6 MiB by default and can be increased to 120 MiB by changing the configuration.

```sql
LONGTEXT [CHARACTER SET charset_name] [COLLATE collation_name]
Expand Down Expand Up @@ -101,15 +101,15 @@ TINYBLOB

### `MEDIUMBLOB` type

The `MEDIUMBLOB` type is similar to the [`BLOB` type](#blob-type). The difference is that the maximum column length of `MEDIUMBLOB` is 16,777,215.
The `MEDIUMBLOB` type is similar to the [`BLOB` type](#blob-type). The difference is that the maximum column length of `MEDIUMBLOB` is 16,777,215. But due to the [Limitation on a single column in TiDB](/tidb-limitations.md#limitation-on-a-single-column), the maximum storage size of a single column in TiDB is 6 MiB by default and can be increased to 120 MiB by changing the configuration.

```sql
MEDIUMBLOB
```

### `LONGBLOB` type

The `LONGBLOB` type is similar to the [`BLOB` type](#blob-type). The difference is that the maximum column length of `LONGBLOB` is 4,294,967,295. But due to the [Limitation on a single column in TiDB](/tidb-limitations.md#limitation-on-a-single-column), the maximum storage size of a single column in TiDB is 6 MB.
The `LONGBLOB` type is similar to the [`BLOB` type](#blob-type). The difference is that the maximum column length of `LONGBLOB` is 4,294,967,295. But due to the [Limitation on a single column in TiDB](/tidb-limitations.md#limitation-on-a-single-column), the maximum storage size of a single column in TiDB is 6 MiB by default and can be increased to 120 MiB by changing the configuration.

```sql
LONGBLOB
Expand Down