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.l...
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...
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...
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...
replace(string text, from text, to text) text 把字串string里出现地所有子字串from替换成子字串to。 replace('abcdefabcdef', 'cd', 'XX') abXXefabXXef rpad(string text, length int [, fill text]) text 通过填充字符fill(缺省时为空白),把string填充为长度length。如果string已经比length长则将其...
create or replace trigger 触发器名 before/after insert/update/delete on 表名 --什么时候的什么操作时执行触发器 for each row --默认表级触发器,加这一行代表这是一个行级触发器 begin SQL语句集; end; 1. 2. 3. 4. 5. 6. 例1:Oracle通过触发器调用序列实现主键自增 ...
create or replace procedure dba_insert_data("id" int,"name" varchar(20),INOUT msg text)language plpgsql as 这里语法 RAISE NOTICE 是输出消息的语句 ,而通过百分号 % 来代表输入变量,然后在输出时标名变量即可。 案例3 将存储过程中的表的字段值输出到存储过程的外部,这就需要在定义存储过程中先定义这个...
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 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, ...
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); ...