CREATE TABLE
CREATE TABLE defines a table that is persisted in durable storage and can be
written to, updated and seamlessly joined with other tables, views or sources.
Tables in Materialize are similar to tables in standard relational databases:
they consist of rows and columns where the columns are fixed when the table is
created but rows can be added to at will via INSERT statements.
Syntax
col_option
| Field | Use |
|---|---|
| TEMP / TEMPORARY | Mark the table as temporary. |
| table_name | A name for the table. |
| col_name | The name of the column to be created in the table. |
| col_type | The data type of the column indicated by col_name. |
| NOT NULL | Do not allow the column to contain NULL values. Columns without this constraint can contain NULL values. |
| default_expr | A default value to use for the column in an INSERT statement if an explicit value is not provided. If not specified, NULL is assumed. |
Details
Known limitations
Tables do not currently support:
- Primary keys
- Unique constraints
- Check constraints
See also the known limitations for INSERT,
UPDATE, and DELETE.
Temporary tables
The TEMP/TEMPORARY keyword creates a temporary table. Temporary tables are
automatically dropped at the end of the SQL session and are not visible to other
connections. They are always created in the special mz_temp schema.
Temporary tables may depend upon other temporary database objects, but non-temporary tables may not depend on temporary objects.
Examples
Creating a table
You can create a table t with the following statement:
CREATE TABLE t (a int, b text NOT NULL);
Once a table is created, you can inspect the table with various SHOW commands.
SHOW TABLES;
TABLES
------
t
SHOW COLUMNS IN t;
name nullable type
-------------------------
a true int4
b false text