The Postgresql ALTER statement is commonly used for operation summaries

2020-05-06 11:52:22
OfStack

postgresql version: psql (9.3.4)

Add a column



ALTER TABLE table_name ADD column_name datatype;

2, delete a column



ALTER TABLE table_name DROP  column_name;

3. Change the data type of the column



ALTER TABLE table_name ALTER  column_name TYPE datatype;

4, rename
of the table



ALTER TABLE table_name RENAME TO new_name;

5. Change the name of the column



ALTER TABLE table_name RENAME column_name to new_column_name;

6. not null of the field is set to

ALTER TABLE table_name ALTER column_name {SET|DROP} NOT NULL;

7. Add default
to the column
ALTER TABLE table_name ALTER column_name SET DEFAULT expression;