ALTER DATABASE语句用于修改数据库。本文为您介绍ALTER DATABASE的用法。 语法 ALTER DATABASE <dbname> SET configuration_parameter { TO | = } { value | DEFAULT } ALTER DATABASE <dbname> SET configuration_parameter FROM CURRENT ALTER DATABASE <dbname> RESET configuration_parameter ALTER DATABASE <dbna...
gaussdb=# SET SEARCH_PATH TO ds, public; -- Set the time/date type to the traditional postgres format (date before month). gaussdb=# SET DATESTYLE TO postgres, dmy; -- Set the character code of the current session to UTF8. gaussdb=# ALTER SESSION SET NAMES 'UTF8'; -- Set the ti...
TheRENAMEforms change the name of a table (or an index, sequence, or view) or the name of an individual column in a table. There is no effect on the stored data. ThePARALLELclause sets the degree of parallelism for a table. TheNOPARALLELclause resets the values to their defaults;relopti...
可选的identity_options子句可用于覆盖序列选项。 ALTER [ COLUMN ] column_name ADD GENERATED [ ALWAYS | BY DEFAULT [ON NULL] ] AS IDENTITY [ [ SEQUENCE NAME sequence_name ] | ( identity_options ) ] 将已有的列设置为IDENTITY列,该列必须为smallint、integer、bigint、decimal、numeric、float、doub...
✅ALTER TABLE name ALTER [COLUMN] colname SET sequence_option ✅ALTER TABLE name ALTER [COLUMN] colname RESTART sequence ✅ALTER TABLE name ALTER [COLUMN] colname DROP IDENTITY ✅ALTER TABLE name ALTER [COLUMN] colname [ SET DATA ] TYPE that does not require on-disk changes#4424 ...
functions do a lot to preserve the properties of the table you didn’t want to change. The functions will handle indexes, sequences, views, constraints, table owner, partitions and more—just like will also recreate the foreign keys on your tables...
gaussdb=# SET SEARCH_PATH TO ds, public; -- Set the time/date type to the traditional postgres format (date before month). gaussdb=# SET DATESTYLE TO postgres, dmy; -- Set the character code of the current session to UTF8. gaussdb=# ALTER SESSION SET NAMES 'UTF8'; -- Set the ti...