postgresql中,许多ddl语句支持if exists、if not exists。例如: postgres=# create table if not exists abce(); CREATE TABLE postgres=# drop table if exists abce; DROP
通过修改表结构设置主键,可以设置一列或多列作为主键,可以指定主键名称。 语法:ALTER TABLE table_name ADD [CONSTRAINT constraint_name] PRIMARY KEY(column_1, column_2);--1. 创建没有任何主键的表。 CREATE TABLE IF NOT EXISTS users(Name varchar(255)); --2. 往表添加数据 INSERT INTO users (Name...
-- Table structure for inet_workbench_dashboard -- --- DROP TABLE IF EXISTS "public"."inet_workbench_dashboard"; CREATE TABLE "public"."inet_workbench_dashboard" ( "id" int8 NOT NULL DEFAULT nextval('inet_workbench_dashboard_id_seq'::regclass), "created_at" timestamp(6), "name" va...
IF NOT EXISTS(SELECT 1 FROM __EFMigrationsHistory WHERE "MigrationId" = 'migrationid') THEN CREATE OR REPLACE FUNCTION test(key1 text) RETURNS void AS $$ BEGIN INSERT INTO table1(c1) VALUES($1); END; $$ LANGUAGE 'plpgsql'; END IF; END $$; 我还尝试添加了同样的错误。 DO $$ BEGIN...
CREATE SEQUENCE test START 1;create table if not exists testpg ("id" int8 not null DEFAULT nextval('test'::regclass),CONSTRAINT "user_vendorcode_pkey" PRIMARY KEY ("id"),"suijishuzi" VARCHAR ( 255 ) COLLATE "pg_catalog"."default"); ...
UPDATE table_name SET col1 = col_val1 WHEN NOT MATCHED THEN INSERT (column_list) VALUES (column_values); 模仿 merge into Account t1 using (select '3' AccountID,'肖文博' AccountName from dual) t2 on (t1.AccountID = t2.AccountID) ...
Using this option, if a conflict occurs then it will update the mentioned data. Here, I have use “Excluded” table which is special table and contains the row-to-be-inserted. 1 2 3 4 INSERT INTO tbl_Employee VALUES (7,'Ramu') ...
grant select,insert,update,deleteon all tablesinschemapublicto 用户名; 撤回权限 代码语言:javascript 代码运行次数:0 运行 AI代码解释 #撤回在public模式下的权限 revoke select on all tablesinschemapublicfrom 用户名;#撤回在information_schema模式下的权限 ...
create tabletb_order(id int primary key,order_novarchar(255));insert into tb_order selectgenerate_series(1,100),md5(random()::varchar);--analyze 统计数据库表数据,统计结果存储到pg_statistic系统表中--vacuum 用于清理死亡元组占用的存储空间 ...
GRANT SELECT, UPDATE, INSERT, DELETE ON TABLE public.user TO mydata_dml; GRANT SELECT ON TABLE public.user TO mydata_qry; 删除账号 #撤回在public模式下的权限 revoke select on all tables in schema public from 用户名; #撤回在information_schema模式下的权限 ...