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系统。data_type_families

包含有关受支持的信息 数据类型.

列:

  • name (字符串) — Data type name.
  • case_insensitive (UInt8) — Property that shows whether you can use a data type name in a query in case insensitive manner or not. For example, Date 和 date 都是有效的。
  • alias_to (字符串) — Data type name for which name 是个化名

示例

  1. SELECT * FROM system.data_type_families WHERE alias_to = 'String'
  1. ┌─name───────┬─case_insensitive─┬─alias_to─┐
  2. │ LONGBLOB   │                1 │ String   │
  3. │ LONGTEXT   │                1 │ String   │
  4. │ TINYTEXT   │                1 │ String   │
  5. │ TEXT       │                1 │ String   │
  6. │ VARCHAR    │                1 │ String   │
  7. │ MEDIUMBLOB │                1 │ String   │
  8. │ BLOB       │                1 │ String   │
  9. │ TINYBLOB   │                1 │ String   │
  10. │ CHAR       │                1 │ String   │
  11. │ MEDIUMTEXT │                1 │ String   │
  12. └────────────┴──────────────────┴──────────┘

另请参阅

  • 语法 — Information about supported syntax.