We can drop a trigger from the table by specifying the name of the trigger and the name of the table to which it is associated. Moreover, there are other keywords that are also used such as the IF EXISTS keyword that would drop the trigger if it exists if it is not then it will j...
*/ FETCH trigger_cursor INTO row; /* Exit when no more records are found. */ EXIT WHEN NOT FOUND; /* Concatenate together a DDL to drop the table with prejudice. */ sql := 'DROP TRIGGER IF EXISTS '||row.trigger_name; /* Execute the DDL statement. */ EXECUTE sql; END LOOP; /...
When a function has any dependent objects such as operators ortriggers, you cannot drop that function. To drop the function and its dependent objects, you can use thecascadeoption. Thedrop functionwith thecascadeoption will recursively remove the function, its dependent objects, and the objects ...
If you remove a table that does not exist, PostgreSQL issues an error. To avoid the error, you can use theIF EXISTSoption. If the table is used in other database objects such asviews,triggers, functions, and stored procedures, you cannot remove it. In this case, you have two options...
不能对系统默认安装的三个数据库(POSTGRES、TEMPLATE0和TEMPLATE1)执行删除操作,系统做了保护。如果想查看当前服务中有哪几个数据库,可以用gsql的\l命令查看。 如果有用户正在与要删除的数据库连接,则删除操作失败。如果要查看当前存在哪些数据库连接,可以通过视图DV_SESSIONS查看。 不能在事务块中执行DROP DATABASE...
It supports many SQL features like complex SQL queries, foreign keys, triggers, views, transactions, concurrency etc. In PostgreSQL, tables can be set to inherit their characteristics from a “parent table”. We can install several extensions to add additional functionality to PostgreSQL. ...
To store the data of the database, we need to offer some location to the data on the disk. This location is called the tablespace in PostgreSQL. The data can be tables, triggers indexes, etc. However, if a tablespace is no longer needed, it can be dropped in PostgreSQL. The tablespac...
sql/postgres: allow extending plans with create/drop trigger changes 12655f3 a8m requested review from rotemtam, giautm and a team December 15, 2023 20:16 View details a8m merged commit 62e7349 into master Dec 16, 2023 24 checks passed a8m deleted the triggeraddrop branch December ...
DROP DATABASE [ IF EXISTS ] name [ [ WITH ] ( option [, ...] ) ] 其中选项 可以是: FORCE 参数 IF EXISTS如果该数据库不存在则不要抛出一个错误,而是发出一个提示。 name要移除的数据库的名称。 FORCE尝试终止与目标数据库的所有现有连接。 如果目标数据库中存在准备好的事务、活跃的逻辑复制槽或订...
DROP TRIGGER <name> Description DROP TRIGGERremoves a trigger from its associated table. The command must be run by a superuser or the owner of the table on which the trigger is defined. Parameters name The name of a trigger to remove. ...