postgresql 删除 数据库,表,索引

1. 删除数据库
-bash-3.2$ createdb abc -O testuser
CREATE DATABASE
-bash-3.2$ dropdb abc //dropdb删除数据库
DROP DATABASE
-bash-3.2$ createdb abc -O testuser
CREATE DATABASE
-bash-3.2$ psql -U testuser -d testuser
Welcome to psql 8.1.23,the Postgresql interactive terminal.

Type: \copyright for distribution terms
\h for help with sql commands
\? for help with psql commands
\g or terminate with semicolon to execute query
\q to quit

testuser=> drop database abc; //登录后的删除数据库，注意，不能删除当前登录的数据库
DROP DATABASE

//删除操作的前提是，你是超级用户，或者是该数据库的拥有者才行。表也一样，pgsql有一点很特别，就是库是你的，表不一定是你的。这个有点搞。

2. 删除索引

ERROR: cannot drop index testuser_id_pk because constraint testuser_id_pk on table test requires it
HINT: You may drop constraint testuser_id_pk on table test instead.

testuser_test=# drop index unique_name; //删除索引
DROP INDEX

3. 删除表 testuser_test=# drop table test,test1; //删除表 DROP TABLE