* queryString: original source text of command * context: identifies source of statement (toplevel client command, * non-toplevel client command, subcommand of a larger utility command) * params: parameters to use during execution * dest: where to send results * completionTag: points to a buf...
postgres=# \h drop tablespace Command: DROP TABLESPACE Description: remove a tablespace Syntax: DROP TABLESPACE [ IF EXISTS ] name 删除表空间前必须要删除该表空间下的所有数据库对象,否则无法删除。 如: postgres=# drop tablespace if exists tbs_test; ERROR: tablespace "tbs_test" is not empty 删除...
TRUNCATEcannot be used on a table that has foreign-key references from other tables, unless all such tables are also truncated in the same command. Checking validity in such cases would require table scans, and the whole point is not to do one. TRUNCATEwill not run any user-definedON DELET...
TRUNCATE cannot be used on a table that has foreign-key references from other tables, unless all such tables are also truncated in the same command. Checking validity in such cases would require table scans, and the whole point is not to do one. TRUNCATE will not run any user-defined ON ...
Command: DROP DATABASE Description: remove a database Syntax: DROP DATABASE [ IF EXISTS ] name [ [ WITH ] ( option [, ...] ) ] where option can be: FORCE URL: https://www.postgresql.org/docs/14/sql-dropdatabase.html postgres=# drop database bbc; ...
postgres-# \help <command_name> 例如,我们查看下 select 语句的语法: postgres=# \help SELECT Command: SELECT Description: retrieve rows from a table or view Syntax: [ WITH [ RECURSIVE ] with_query [, ...] ] SELECT [ ALL | DISTINCT [ ON ( expression [, ...] ) ] ] ...
We can drop a tablespace in Postgres. The basic syntax for dropping the tablespace is given as: DROPTABLESPACE[IFEXISTS] tabsp_name; In this syntax: ● We write the commandDROP TABLESPACEto drop the tablespace. ● TheIF EXISTSclause is also written which will drop the tablespace only if it...
postgres-# \help <command_name>例如,我们查看下 select 语句的语法:postgres=# \help SELECT Command: SELECT Description: retrieve rows from a table or view Syntax: [ WITH [ RECURSIVE ] with_query [, ...] ] SELECT [ ALL | DISTINCT [ ON ( expression [, ...] ) ] ] [ * | ...
CommitTransactionCommand处理事务堆栈2 plpgsql异常处理中的子事务 plpgsql中的异常处理部分也是用子事务实现的,在begin end块中的语句都是运行在子事务下的,如果发生异常,所有的处理都会自动回滚,然后跳转到exception部分继续执行。也就是在plpgsql中只要有exception的语句,那么上面的begin中都会运行在子事务下。 pgpgsql...