postgres=# \sv pg_user CREATE OR REPLACE VIEW pg_catalog.pg_user AS SELECT pg_shadow.usename, pg_shadow.usesysid, pg_shadow.usecreatedb, pg_shadow.usesuper, pg_shadow.userepl, pg_shadow.usebypassrls, '***'::text AS passwd, pg_shadow.valuntil, pg_shadow.useconfig FROM pg_shadow po...
INSERT INTO EMP VALUES (7566,'JONES','MANAGER',7839,to_date('2-4-1981','dd-mm-yyyy'),2975,NULL,20); create or replace procedure p_sql is v_sql varchar(500); vret number; vin number:=1111; begin perform dbms_output.serveroutput('t'); v_sql:='select sal from emp wh...
create [or replace] trigger trigger_name before | after | instead of --触发时间 insert[or] | update[or] | delete --触发事件 [of col_name] --指定将被更新的列名 on table_name --指定触发器相关联的表或视图 [for each row] --触发类型 [when(condition)]--触发条件 pl/sql_block; 1. 2...
CREATEORREPLACEFUNCTION"public"."func1"()RETURNS"pg_catalog"."text"AS$BODY$ declare val text;BEGINinsert into avalues(1,'小明')returning name into val;returnval;END$BODY$LANGUAGEplpgsqlVOLATILECOST100 这个函数的结果会返回val的值,如下图: 并且在表a中会插入一条数据,如下图。 这里敲黑板!!! ...
CREATE [ OR REPLACE ] VIEW name [ ( column_name [, ...] ) ] AS queryDEALLOCATE删除一个准备好的查询。DEALLOCATE [ PREPARE ] plan_nameDECLARE定义一个游标。DECLARE name [ BINARY ] [ INSENSITIVE ] [ [ NO ] SCROLL ] CURSOR [ { WITH | WITHOUT } HOLD ] FOR query [ FOR { READ ONLY...
CREATE[OR REPLACE]TRIGGERTRIGGER_NAME {BEFORE|AFTER} TRIGGER_EVENTONTABLE_NAME[FOR EACH ROW][WHEN TRIGGER_CONDITION]TRIGGER_BODY 语法解释: TRIGGER_NAME 触发器名称 BEFORE|AFTER 指定触发器是在触发事件发生之前触发或者发生之后触发 TRIGGER_EVENT 触发事件,在DML触发器中主要为INSERT、UPDATE、DELETE等 ...
insert 所有字段都是空null 将要插入的数据 update 更新之前改行的值 更新之后的值 delete 删除之前该行的值 所有字段都是空null 1. 2. 3. 4. 5.语句级触发器例子 create or replace trigger t1 after insert on emp declare begin dbms_output.put_line('一个新员工入职'); ...
insert into t_boolean(ifval) values(false); --执行插入 如上可以看到ifval的类型是数值,而insert的值是boolean,自定义函数如下: create or replace function boolean_to_numeric(boolean) returns numeric as $$ select decode($1::boolean,'f'::boolean,0::numeric,'t'::boolean,1::numeric,true); ...
createorreplacefunctiontrack_employees_change()returnstriggeras$$beginiftg_op='INSERT'theninsertintoemployees_history(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,commission_pct,manager_id,department_id,action_type,change_dt)values(new.employee_id,new.first_name,new....
CREATE OR REPLACE PROCEDURE AddEmployee ( EmpId INOUT INT, EmpName VARCHAR(100), EmpDob DATE, EmpCity VARCHAR(100), EmpDesignation VARCHAR(100), EmpJoiningDate DATE ) LANGUAGE plpgsql AS $$ BEGIN INSERT INTO Employees (Name,DateOfBirth,City,Designation,JoiningDate) VALUES (EmpName, EmpDob, ...