Gbase 8C - SQL reference 6 SQL syntax (11)

1. DROP TABLESPACE

Function description

Remove a table space .

Grammar format

DROP TABLESPACE [ IF EXISTS ] name

Parameter description

1. IF EXISTS： If the tablespace does not exist , No error, just prompt ;
2. name： The name of the tablespace .

matters needing attention

DROP TABLESPACE Cannot execute within a transaction .

Only the tablespace owner has permission to execute DROP TABLESPACE command .

Example

DROP TABLESPACE gbase8c;

Grammar compatible

DROP TABLESPACE It's a PostgreSQL Expand .

Related to the grammar

CREATE TABLESPACE, ALTER TABLESPACE

1. DROP TEXT SEARCH CONFIGURATION

Function description

Delete existing text search configuration .

Grammar format

DROP TEXT SEARCH CONFIGURATION [ IF EXISTS ] name [ CASCADE | RESTRICT ]

Parameter description

1. IF EXISTS： If the text search configuration does not exist , No error, just prompt ;
2. name： Existing text search configuration name , Can be modified by patterns ;

1. CASCADE： Automatically delete objects that depend on the text search configuration , And all objects that depend on those objects ;

1. RESTRICT： If any object depends on the text search configuration , Then refuse to delete , This is the default setting .

matters needing attention

To execute this command , The user must be the owner of the configuration .

Example

DROP TEXT SEARCH CONFIGURATION gdt1;

DROP TEXT SEARCH CONFIGURATION

Grammar compatible

SQL There is no in the standard DROP TEXT SEARCH CONFIGURATION sentence .

Related to the grammar

ALTER TEXT SEARCH CONFIGURATION, CREATE TEXT SEARCH CONFIGURATION

1. DROP TEXT SEARCH DICTIONARY

Function description

Delete the full-text search dictionary .

Grammar format

DROP TEXT SEARCH DICTIONARY [ IF EXISTS ] name [ CASCADE | RESTRICT ]

Parameter description

1. IF EXISTS： If the full-text search dictionary does not exist , No error, just prompt ;
2. name： The name of the existing text search dictionary , Can be modified by patterns ;

1. CASCADE： Automatically delete objects that depend on the full-text search dictionary , And all objects that depend on those objects ;

1. RESTRICT： If any object depends on the full-text search dictionary , Then refuse to delete , This is the default setting .

matters needing attention

Only the owner of the dictionary can execute DROP operation .

Example

DROP TEXT SEARCH DICTIONARY my_russian;

Grammar compatible

SQL There is no in the standard DROP TEXT SEARCH DICTIONARY sentence .

Related to the grammar

ALTER TEXT SEARCH DICTIONARY, CREATE TEXT SEARCH DICTIONARY

1. DROP TEXT SEARCH PARSER

Function description

Remove a text search parser .

Grammar format

DROP TEXT SEARCH PARSER [ IF EXISTS ] name [ CASCADE | RESTRICT ]

Parameter description

1. IF EXISTS： If the text search parser does not exist , No error, just prompt ;
2. name： The name of the existing text search parser , Can be modified by patterns ;

1. CASCADE： Automatically delete objects that depend on the text search parser , And all objects that depend on those objects ;

1. RESTRICT： If any object depends on the text search parser , Then refuse to delete , This is the default setting .

matters needing attention

Only system administrators can remove the text search parser .

Grammar compatible

SQL There is no in the standard DROP TEXT SEARCH PARSER sentence .

Related to the grammar

ALTER TEXT SEARCH PARSER, CREATE TEXT SEARCH PARSER

1. DROP TEXT SEARCH TEMPLATE

Function description

Remove a text search template .

Grammar format

DROP TEXT SEARCH TEMPLATE [ IF EXISTS ] name [ CASCADE | RESTRICT ]

Parameter description

1. IF EXISTS： If the text search template exists , No error, just prompt ;
2. name： Name of existing text search template , Can be modified by patterns ;

1. CASCADE： Automatically delete objects that depend on the text search template , And all objects that depend on those objects ;

1. RESTRICT： If any object depends on the text search template , Then refuse to delete , This is the default setting .

matters needing attention

Only super users can remove text search templates .

Grammar compatible

SQL There is no in the standard DROP TEXT SEARCH TEMPLATE sentence .

Related to the grammar

ALTER TEXT SEARCH TEMPLATE, CREATE TEXT SEARCH TEMPLATE

1. DROP TRANSFORM

Function description

Remove transformation .

Grammar format

DROP TRANSFORM [ IF EXISTS ] FOR type_name LANGUAGE lang_name [ CASCADE | RESTRICT ]

Parameter description

1. IF EXISTS： If the transformation does not exist , No error, just prompt ;
2. type_name： The name of the data type to be converted ;
3. lang_name： The name of the language to be converted ;

1. CASCADE： Automatically delete objects that depend on this transformation , And all objects that depend on those objects ;

1. RESTRICT： If any object depends on this transformation , Then refuse to delete , This is the default setting .

matters needing attention

Only users with this type and language can delete the transformation .

Example

DROP TRANSFORM FOR hstore LANGUAGE plpythonu;

Grammar compatible

In this form DROP TRANSFORM It's a kind of PostgreSQL Expand .

Related to the grammar

CREATE TRANSFORM

1. DROP TYPE

Function description

Remove a data type .

Grammar format

DROP TYPE [ IF EXISTS ] name [, ...] [ CASCADE | RESTRICT ]

Parameter description

1. IF EXISTS： If the type does not exist , No error, just prompt ;
2. name： The name of the data type to be removed , Can be modified by patterns ;

1. CASCADE： Automatically delete objects that depend on this type （ For example, table columns 、 function 、 The operator ）, And all objects that depend on those objects ;

1. RESTRICT： If any object depends on this type , Then refuse to delete , This is the default setting .

matters needing attention

Only the owner of the type can delete the type .

Example

DROP TYPE g_compfoo;

DROP TYPE

Grammar compatible

This order is similar to SQL The corresponding command in the standard , but IF EXISTS Clause It's a PostgreSQL Expand .

Related to the grammar

ALTER TYPE, CREATE TYPE

1. DROP USER

Function description

Remove a database role .

Grammar format

DROP USER [ IF EXISTS ] name [, ...]

matters needing attention

DROP USER yes DROP ROLE An alias for .

Grammar compatible

DROP USER The statement is a PostgreSQL Expand .

Related to the grammar

ALTER USER, CREATE USER, DROP ROLE

1. DROP VIEW

Function description

Remove a view .

Grammar format

DROP VIEW [ IF EXISTS ] name [, ...] [ CASCADE | RESTRICT ]

Parameter description

1. IF EXISTS： If the view does not exist , No error, just prompt ;
2. name： Name of the view to be removed , Can be modified by patterns ;

1. CASCADE： Automatically delete objects that depend on this view （ For example, other views ）, And all objects that depend on those objects ;

1. RESTRICT： If any object depends on this view , Then refuse to delete , This is the default setting .

matters needing attention

Only the owner of the view can delete the view .

Example

DROP VIEW g_view;

DROP VIEW

Grammar compatible

This command conforms to SQL standard , Only IF EXISTS The option is a PostgreSQL Expand .

Related to the grammar

ALTER VIEW, CREATE VIEW

1. END

Function description

Commit the current transaction .

Grammar format

END [ WORK | TRANSACTION ]

Parameter description

1. WORK | TRANSACTION： Optional keywords , There is no effect .

matters needing attention

END The command is equivalent to COMMIT.

Example

END;

COMMIT

Grammar compatible

END It's a kind of PostgreSQL Expand .

Related to the grammar

BEGIN, COMMIT, ROLLBACK