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Document SQL modes #2672

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Create sql-modes.md
angelamayxie Sep 15, 2025
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Update README.md
angelamayxie Sep 15, 2025
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angelamayxie Sep 15, 2025
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1 change: 1 addition & 0 deletions packages/dolt/content/SUMMARY.md
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Expand Up @@ -89,6 +89,7 @@
- [MySQL Information Schema](reference/sql/sql-support/information-schema.md)
- [Collations and Character Sets](reference/sql/sql-support/collations-and-charsets.md)
- [System Variables](reference/sql/sql-support/system-variables.md)
- [SQL Modes](reference/sql/sql-support/sql-modes.md)
- [Miscellaneous](reference/sql/sql-support/miscellaneous.md)
- [Supported Clients](reference/sql/supported-clients/README.md)
- [Programmatic](reference/sql/supported-clients/clients.md)
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3 changes: 2 additions & 1 deletion packages/dolt/content/reference/sql/sql-support/README.md
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Expand Up @@ -22,4 +22,5 @@ This section is divided into five main categories:
4. [Information Schema](information-schema.md): Dolt support for MySQL information schema
5. [Collations and Character Sets](collations-and-charsets.md): SQL features for describing and comparing strings
6. [System Variables](system-variables.md): SQL features for configuring server behavior
7. [Miscellaneous](miscellaneous.md): miscellaneous SQL features
7. [SQL Modes](sql-modes.md): Dolt support for MySQL SQL modes
8. [Miscellaneous](miscellaneous.md): miscellaneous SQL features
27 changes: 27 additions & 0 deletions packages/dolt/content/reference/sql/sql-support/sql-modes.md
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# SQL Modes

Dolt supports a subset of [SQL modes that MySQL supports](https://dev.mysql.com/doc/refman/8.4/en/sql-mode.html).
SQL modes are added upon request, so please [file an issue](https://github.com/dolthub/dolt/issues) if a SQL mode you need is missing.

**Currently supporting 4 of 18 MySQL SQL Modes.**

| Mode | Parsed | Supported |
|:---------------------------------------------------------------|:-------|:----------|
| `ALLOW_INVALID_DATES` | ❌ | ❌ |
| `ANSI_QUOTES` | ✅ | ✅ |
| `ERROR_FOR_DIVISION_BY_ZERO` | ❌ | ❌ |
| `HIGH_NOT_PRECEDENCE` | ❌ | ❌ |
| `IGNORE_SPACE` | ❌ | ❌ |
| `NO_AUTO_VALUE_ON_ZERO` | ✅ | ✅ |
| `NO_BACKSLASH_ESCAPES` | ❌ | ❌ |
| `NO_DIR_IN_CREATE` | ❌ | ❌ |
| `NO_ENGINE_SUBSTITUION` | ✅ | ❌ |
| `NO_UNSIGNED_SUBTRACTION` | ❌ | ❌ |
| `NO_ZERO_IN_DATE` | ❌ | ❌ |
| `ONLY_FULL_GROUP_BY` | ✅ | ✅ |
| `PAD_CHAR_TO_FULL_LENGTH` | ❌ | ❌ |
| `PIPES_AS_CONCAT` | ✅ | ✅ |
| `REAL_AS_FLOAT` | ❌ | ❌ |
| `STRICT_ALL_TABLES` | ❌ | ❌ |
| `STRICT_TRANS_TABLES` | ✅ | ❌ |
| `TIME_TRUNCATE_FRACTIONAL` | ❌ | ❌ |