*: default value tiny update #17136
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*: default value tiny update #17136
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data-type-default-values.md
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| @@ -8,7 +8,7 @@ aliases: ['/docs/dev/data-type-default-values/','/docs/dev/reference/sql/data-ty | |||
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| The `DEFAULT` value clause in a data type specification indicates a default value for a column. The default value must be a constant and cannot be a function or an expression. But for the time type, you can specify the `NOW`, `CURRENT_TIMESTAMP`, `LOCALTIME`, and `LOCALTIMESTAMP` functions as the default for `TIMESTAMP` and `DATETIME` columns. | |||
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| Starting from v8.0.0, TiDB supports [specifying expressions as default values](#specify-expressions-as-default-values) for [`BLOB`](/data-type-string.md#blob-type), [`TEXT`](/data-type-string.md#text-type), and [`JSON`](/data-type-json.md#json-type) data types. | |||
| Starting from v8.0.0, TiDB additionally supports [specifying expressions as default values](#specify-expressions-as-default-values) for [`BLOB`](/data-type-string.md#blob-type), [`TEXT`](/data-type-string.md#text-type), and [`JSON`](/data-type-json.md#json-type) data types. You can set default values for all data types, but you can only use expressions to set the [default values](#default-values) for `BLOB`, `TEXT`, and `JSON` data types. | |||
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| Starting from v8.0.0, TiDB additionally supports [specifying expressions as default values](#specify-expressions-as-default-values) for [`BLOB`](/data-type-string.md#blob-type), [`TEXT`](/data-type-string.md#text-type), and [`JSON`](/data-type-json.md#json-type) data types. You can set default values for all data types, but you can only use expressions to set the [default values](#default-values) for `BLOB`, `TEXT`, and `JSON` data types. | |
| Starting from v8.0.0, you can use expressions to set [default values](#default-values) for [`BLOB`](/data-type-string.md#blob-type), [`TEXT`](/data-type-string.md#text-type), and [`JSON`](/data-type-json.md#json-type) data types. Before v8.0.0, setting default values for these three data types is not supported. |
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[APPROVALNOTIFIER] This PR is APPROVED This pull-request has been approved by: hfxsd The full list of commands accepted by this bot can be found here. The pull request process is described here
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