PostgreSQL中的视图是通过规则系统实现的。通过“创建视图”命令定义视图时,将自动生成相应的规则并将其存储在目录中。 假设已经定义了以下视图并且相应的规则存储在pg_rules系统目录中。 CREATE VIEW employees_list AS SELECT e.id, e.name, d.name AS department FROM employees AS e, departments AS d WHERE e...
3. 编译Procedure/Function/Package时需加入Debug信息. ALTER PROCEDURE/FUNCTION/PACKAGE NAME COMPILE DEBUG; Edit/Undo Ctrl+Z Edit/Redo Shift+Ctrl+Z Edit/PL/SQL Beautifier Ctrl+W (自定义) Shift+Home 选择光标位置到行首 Shift+End 选择光标位置到行尾 Ctrl+Shift+Home 选择光标位置到首行行首 Ctrl+Shift...
ALTER SEQUENCE tablename_colname_seq OWNED BY tablename.colname; 1. 2. 3. 4. 5. 因此,我们就创建了一个整数列并且把它的缺省值安排为从一个序列发生器取值。应用了一个NOT NULL约束以确保空值不会被插入(在大多数情况下你可能还希望附加一个UNIQUE或者PRIMARY KEY约束避免意外地插入重复的值,但这...
Command:CREATETRIGGERDescription:define anewtriggerSyntax:CREATE[CONSTRAINT]TRIGGERname{BEFORE|AFTER|INSTEADOF}{event[OR...]}ONtable_name[FROMreferenced_table_name]{NOTDEFERRABLE|[DEFERRABLE]{INITIALLYIMMEDIATE|INITIALLYDEFERRED}}[FOR[EACH]{ROW|STATEMENT}][WHEN(condition)]EXECUTEPROCEDUREfunction_name(argume...
postgres=# select * from pg_tables where tablename='t'; schemaname | tablename | tableowner | tablespace | hasindexes | hasrules | hastriggers
#用户要对schema usage 权限,不然要select*from schema_name.table,不能用搜索路径GRANT USAGEONSCHEMA abcTOabc;grantselectONALL TABLESINSCHEMA abctoabc;ALTERDEFAULTPRIVILEGESINSCHEMA abcGRANTselectON TABLESTOabc;createuser abc_wwith ENCRYPTED password'';createuser abc_rwith ENCRYPTED password'';GRANT abc...
假设已经定义了以下视图并且相应的规则存储在pg_rules系统目录中。 CREATE VIEW employees_list AS SELECT e.id, e.name, d.name AS department FROM employees AS e, departments AS d WHERE e.department_id = d.id; Planner and Executor 规划器从重写器接收查询树,并生成(查询)计划树,执行者可以最有效地...
在PostgreSQL 10 中,分区上的索引需要基于各个分区手动创建,而不能基于分区的父表创建索引。PostgreSQL 11 可以基于分区表创建索引。如果在分区表上创建了一个索引,PostgreSQL 自动为每个分区创建具有相同属性的索引。 PostgreSQL 12后: ALTER TABLE ATTACH PARTITION不会阻塞查询3...
postgres=# select * from pg_tables where schemaname='testdb'; schemaname | tablename | tableowner | tablespace | hasindexes | hasrules | hastriggers | rowsecurity ---+---+---+---+---+---+---+--- (0 rows) ## 退出当前登录的账号 postgres=# \q 4。查看所有用户 postgres=# s...
testdb=>CREATETABLEt(idint)tablespaceapp_tbs;CREATETABLEtestdb=>SELECT*FROMpg_tablesWHEREtablename='t';schemaname|tablename|tableowner|tablespace|hasindexes|hasrules|hastriggers|rowsecurity---+---+---+---+---+---+---+---public|t|tony|app_tbs|f|f|f|f(1row) PostgreSQL 支持在CREATE...