Postgre中,Portal是个抽象概念,它表示一个正在运行或可运行Query的执行状态。 对于可以生成执行计划的SQL语句(planable SQL),都通过ProcessQuery来处理;对于不能生成执行计划的SQL语句,取名为命令型SQL(Command SQL),都通过PortalRunUtility来处理。 参考: 1. gdb使用 http://blog.chinaunix.net/uid-20788636-id-1841...
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...
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; DROP DATABASE 用户和权限操作 P...
DROP SCHEMA name [, ...] [ CASCADE | RESTRICT ] DROP SEQUENCE 删除一个序列。 DROP SEQUENCE name [, ...] [ CASCADE | RESTRICT ] DROP TABLE 删除一个表。 DROP TABLE name [, ...] [ CASCADE | RESTRICT ] DROP TABLESPACE 删除一个表空间。 DROP TABLESPACE tablespace_name DROP TRIGGER 删除...
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 [, ...] ) ] ] [ * | ...
Only the owner of a table mayTRUNCATEit. 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. ...
DROP TABLE name [, ...] [ CASCADE | RESTRICT ] 1. Description AI检测代码解析 DROP TABLE removes tables from the database. 1. AI检测代码解析 Only its owner may destroy a table. 1. AI检测代码解析 To empty a table of rows, without destroying the table, use DELETE. ...
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...