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Improve usage of IMPORT FROM SELECT (#19777) #19781

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Dec 24, 2024
Merged

Improve usage of IMPORT FROM SELECT (#19777) #19781

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Update sql-statement-import-into.md
hfxsd Dec 24, 2024
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Update wording
lilin90 Dec 24, 2024
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Update sql-statements/sql-statement-import-into.md
hfxsd Dec 24, 2024
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1 change: 1 addition & 0 deletions sql-statements/sql-statement-import-into.md
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Expand Up @@ -49,6 +49,7 @@ The `IMPORT INTO` statement lets you import data to TiDB via the [Physical Impor
- `IMPORT INTO ... FROM SELECT` does not support the task management statements such as `SHOW IMPORT JOB(s)` and `CANCEL IMPORT JOB <job-id>`.
- The [temporary directory](https://docs.pingcap.com/tidb/stable/tidb-configuration-file#temp-dir-new-in-v630) of TiDB requires sufficient space to store the entire query result of the `SELECT` statement (configuring the `DISK_QUOTA` option is not supported currently).
- Importing historical data using [`tidb_snapshot`](/read-historical-data.md) is not supported.
- Because the syntax of the `SELECT` clause is complex, the `WITH` parameter in `IMPORT INTO` might conflict with it and cause parsing errors, such as `GROUP BY ... [WITH ROLLUP]`. It is recommended to create a view for complex `SELECT` statements and then use `IMPORT INTO ... FROM SELECT * FROM view_name` for importing. Alternatively, you can clarify the scope of the `SELECT` clause with parentheses, such as `IMPORT INTO ... FROM (SELECT ...) WITH ...`.

## Prerequisites for import

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