postgres=# create table t_kenyon(id serial primary key,items int[]); NOTICE: CREATE TABLE will create implicit sequence "t_kenyon_id_seq" for serial column "t_kenyon.id" NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "t_kenyon_pkey" for table "t_kenyon" CREATE TABLE pos...
A trigger function must return either NULL or a record/row value having exactly the structure of the table the trigger was fired for. 以plpgsql为例,触发器函数范例。 使用hstore 和触发器跟踪敏感数据的DML。 创建需要被跟踪的测试表 CREATE TABLE test (id int primary key, info text, crt_time ...
(2)在COMPANY表上创建触发器之前,首先创建一个名为auditlogfunc()的函数/过程。 createorreplacefunctionauditlogfunc()returnstriggeras$example_table$begininsertintoaudit(emp_id,entry_date)values(new.id,current_timestamp);returnnew;end$example_table$languageplpgsql; (3)创建触发器函数 create trigger exampl...
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;...
create or replace function match_chunks(chunck_embedding vector(1536), threshold float, count int, min_length int) returns table (id bigint, content text, similarity float) language plpgsql as $$ begin return query select doc_chunks.id, ...
In this example: First, the CTE returns the sales summarized by year. Then, the outer query uses the LEAD() function to return the sales of the following year for each row. The following example uses two common table expressions to return the sales variance between the current year and the...
typedefstructMemoryContextData{NodeTag type;/*内存节点类型 identifies exact kind of context */MemoryContextMethods*methods;/*内存处理函数指针 virtual function table */MemoryContext parent;/*父节点指针 NULL if no parent (toplevel context) */MemoryContext firstchild;/*第一个子节点 head of linked li...
override CPPFLAGS :=$(filter-out -fPIE, $(CPPFLAGS)) -fPIC 编译安装时报错:error: invalid conversion from ‘void’ to ‘char’ [-fpermissive] 解决方法:参考 5 类型转换 create extension 时报错:could not find function “xxx” in file “xxx.so” 解决方法:参考 6 函数声明。相关...
问PostgreSQL:查询的动态WHERE条件EN在做搜索时，经常会遇到多条件查询，且这些条件是不定的，也就是说...
RETURNS TABLE(name VARCHAR, email VARCHAR) AS $$ BEGIN RETURN QUERY SELECT * FROM users; END; $$ LANGUAGE plpgsql; 对比:MySQL使用CREATE PROCEDURE,而PostgreSQL使用CREATE FUNCTION,语法差异较大。 18. JSON数据处理 MySQL SELECT JSON_EXTRACT(data, '$.name') FROM users; ...