95 lines
3.1 KiB
Plaintext
95 lines
3.1 KiB
Plaintext
CREATE TABLE ttable1 OF nothing;
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ERROR: type "nothing" does not exist
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CREATE TYPE person_type AS (id int, name text);
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CREATE TABLE persons OF person_type;
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CREATE TABLE IF NOT EXISTS persons OF person_type;
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NOTICE: relation "persons" already exists, skipping
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SELECT * FROM persons;
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id | name
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----+------
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(0 rows)
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\d persons
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Table "public.persons"
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Column | Type | Modifiers
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--------+---------+-----------
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id | integer |
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name | text |
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Typed table of type: person_type
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CREATE FUNCTION get_all_persons() RETURNS SETOF person_type
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LANGUAGE SQL
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AS $$
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SELECT * FROM persons;
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$$;
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SELECT * FROM get_all_persons();
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id | name
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----+------
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(0 rows)
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-- certain ALTER TABLE operations on typed tables are not allowed
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ALTER TABLE persons ADD COLUMN comment text;
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ERROR: cannot add column to typed table
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ALTER TABLE persons DROP COLUMN name;
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ERROR: cannot drop column from typed table
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ALTER TABLE persons RENAME COLUMN id TO num;
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ERROR: cannot rename column of typed table
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ALTER TABLE persons ALTER COLUMN name TYPE varchar;
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ERROR: cannot alter column type of typed table
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CREATE TABLE stuff (id int);
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ALTER TABLE persons INHERIT stuff;
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ERROR: cannot change inheritance of typed table
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CREATE TABLE personsx OF person_type (myname WITH OPTIONS NOT NULL); -- error
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ERROR: column "myname" does not exist
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CREATE TABLE persons2 OF person_type (
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id WITH OPTIONS PRIMARY KEY,
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UNIQUE (name)
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);
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NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "persons2_pkey" for table "persons2"
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NOTICE: CREATE TABLE / UNIQUE will create implicit index "persons2_name_key" for table "persons2"
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\d persons2
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Table "public.persons2"
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Column | Type | Modifiers
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--------+---------+-----------
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id | integer | not null
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name | text |
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Indexes:
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"persons2_pkey" PRIMARY KEY, btree (id)
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"persons2_name_key" UNIQUE CONSTRAINT, btree (name)
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Typed table of type: person_type
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CREATE TABLE persons3 OF person_type (
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PRIMARY KEY (id),
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name WITH OPTIONS DEFAULT ''
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);
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NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "persons3_pkey" for table "persons3"
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\d persons3
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Table "public.persons3"
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Column | Type | Modifiers
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--------+---------+------------------
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id | integer | not null
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name | text | default ''::text
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Indexes:
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"persons3_pkey" PRIMARY KEY, btree (id)
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Typed table of type: person_type
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CREATE TABLE persons4 OF person_type (
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name WITH OPTIONS NOT NULL,
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name WITH OPTIONS DEFAULT '' -- error, specified more than once
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);
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ERROR: column "name" specified more than once
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DROP TYPE person_type RESTRICT;
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ERROR: cannot drop type person_type because other objects depend on it
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DETAIL: table persons depends on type person_type
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function get_all_persons() depends on type person_type
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table persons2 depends on type person_type
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table persons3 depends on type person_type
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HINT: Use DROP ... CASCADE to drop the dependent objects too.
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DROP TYPE person_type CASCADE;
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NOTICE: drop cascades to 4 other objects
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DETAIL: drop cascades to table persons
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drop cascades to function get_all_persons()
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drop cascades to table persons2
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drop cascades to table persons3
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DROP TABLE stuff;
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