> ## Documentation Index
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> Use this file to discover all available pages before exploring further.

> System table containing information about supported data types

# system.data_type_families

<h2 id="description">
  Description
</h2>

Contains information about supported [data types](/reference/data-types).

<h2 id="columns">
  Columns
</h2>

* `name` ([String](/reference/data-types)) — Data type name.
* `case_insensitive` ([UInt8](/reference/data-types)) — Property that shows whether you can use a data type name in a query in case insensitive manner or not. For example, `Date` and `date` are both valid.
* `alias_to` ([String](/reference/data-types)) — Data type name for which `name` is an alias.

<h2 id="example">
  Example
</h2>

```sql theme={null}
SELECT * FROM system.data_type_families WHERE alias_to = 'String'
```

```text theme={null}
┌─name───────┬─case_insensitive─┬─alias_to─┐
│ LONGBLOB   │                1 │ String   │
│ LONGTEXT   │                1 │ String   │
│ TINYTEXT   │                1 │ String   │
│ TEXT       │                1 │ String   │
│ VARCHAR    │                1 │ String   │
│ MEDIUMBLOB │                1 │ String   │
│ BLOB       │                1 │ String   │
│ TINYBLOB   │                1 │ String   │
│ CHAR       │                1 │ String   │
│ MEDIUMTEXT │                1 │ String   │
└────────────┴──────────────────┴──────────┘
```

<h2 id="see-also">
  See also
</h2>

* [Syntax](/reference/syntax) — Information about supported syntax.