#definePG_FUNCTION_ARGSFunctionCallInfo fcinfo typedef struct FunctionCallInfoData*FunctionCallInfo;typedefDatum(*PGFunction)(FunctionCallInfo fcinfo);typedef struct Node*fmNodePtr;typedef uintptr_t Datum;typedef struct Node{NodeTag type;//NodeTag 这是一个枚举类型}Node;typedef struct FmgrInfo{PGFunction ...
使用raise notice TG_NAME跟踪调用顺序 : // 表举例 // 创建测试表 postgres=# create table digoal (id int); CREATE TABLE // 创建触发器函数 postgres=# create or replace function debug() returns trigger as $$ declare begin raise notice '%', TG_NAME; return new; end; $$ language plpgsql;...
CREATETABLEfoo (fooidINT, foosubidINT, fooname TEXT);INSERTINTOfooVALUES(1,2,'three');INSERTINTOfooVALUES(4,5,'six');CREATEORREPLACEFUNCTIONget_all_foo()RETURNSSETOF fooAS$BODY$DECLAREr foo%rowtype;BEGINFORrINSELECT*FROMfooWHEREfooid>0LOOP-- some processing belowr.foosubid=r.foosubid+...
create or replace function fun_ran return varchar2 is v1 number; begin v1:=dbms_random.value(1,100); if v1 >95 then return '1等奖'; elsif v1>85 then return '2等奖'; elsif v1>70 then return '3等奖'; else return '谢谢惠顾'; end if; end;select fun_ran from dual 1. 2. ...
有scheme参数 创建函数 CREATE OR REPLACE FUNCTION show_create_table( in_schema_name varchar, in_table_name varchar ) RETURNS text LANGUAGE plpgsql VOLATILE AS
PolarDB PostgreSQL版(兼容Oracle)2.0版本支持rownum语法来标志查询结果中的行号;支持全局唯一的序列;支持select/delete/update作用于子查询的语法;支持select for update wait语法;支持merge into语法在视图中使用;支持基本的HINT语法;支持Rename To语法;支持alter table add (col1, col2)语法;...
{NodeTagtype;RangeVar*relation;/* the relation to copy */Node*query;/* the query (SELECT or DML statement with* RETURNING) to copy, as a raw parse tree */List*attlist;/* List of column names (as Strings), or NIL* for all columns */boolis_from;/* TO or FROM */boolis_program...
CREATE TABLE tb_test(id int); SELECT * FROM dts_audit.dts_tb_ddl_command; DDL防火墙 您可以根据业务需求创建事件触发器,使用ddl_command_start事件类型,可以阻止相应的DDL语句执行。 创建触发器函数。 CREATE OR REPLACE FUNCTION abort1() RETURNS event_trigger LANGUAGE plpgsql AS $$ BEGIN if current_...
PostgreSQL AVG function example The sample table If we want to find the average salary for all employees in theemployeetable, the following SQL can be used. SQL Code: SELECT AVG(salary) FROM employee; Output: Visual Presentation of PostgreSQL AVG() function ...
Fixed the issue of sys.identity_columns view was wrongly returning more entries than it should. Fixed the issue of CASE statement and MIN/MAX functions related to error of string size not being defined or using explicit cast. Fixed an issue with ISNUMERIC function to return correct result for...