testdb-# select id, name from CTE; id | name ---+--- 2 | CC 4 | Eoe 3 | Dod 5 | Fof 6 | Gog (5 rows) testdb=# with move_rows as (delete from employer where salary >= 30000 returning *) insert into company (select id, name, age, address, salary from move_rows); I...
delete from results where ctid in (select min(ctid) from results where code = 'BANK1' and status = 0 group by trade_numeber) and code = 'BANK1' and status = 0 order by trade_numeber; -- 检查去重之后的结果 select * from results where code = 'BANK1' and status = 0 ; commit; ...
CREATETABLEhwb(idBIGINT(4)notnull,namevarchar(10),PRIMARYKEY(id))ENGINE=INNODB;INSERTINTOhwbVALUES(1,'TOM');INSERTINTOhwbVALUES(2,'ALLEN');INSERTINTOhwbVALUES(3,'ALLEN');INSERTINTOhwbVALUES(4,'SMITH');INSERTINTOhwbVALUES(5,'SMITH');INSERTINTOhwbVALUES(6,'SMITH');commit;SELECT*FROMhwb; ...
INSERT INTO test (id,name) VALUES (1,'bob'); INSERT INTO test (id,name) VALUES (2,'tom'); INSERT INTO test (id,name) VALUES (3,'jim'); INSERT INTO test (id,name) VALUES (4,'amy'); 1. 2. 3. 4. 查看该表每一行记录的ctid情况: SELECT ctid,* FROM test; ctid | id | na...
-- 插入 JSON 数据 INSERT INTO example (data) VALUES ('{"name": "Alice", "age": 30, "city": "Wonderland"}'::jsonb); -- 查询 JSON 数据 SELECT data->>'name' AS name, data->>'age' AS age FROM example; 5. 注意事项和最佳实践 索引使用:对于频繁的查询操作,可以在...
create tablet4(id1 int,id2 int);insert into t4 selectgenerate_series(1,1000),generate_series(1,1000);insert into t4 select*from t4; 说明: id1列应用了3个统计方法,占了3个slot,分别是MCV(1)、直方图(2)、相关系数(3) stakind1为1,表示使用MCV,stanumbers1保存的是高频值数组,数组中记录的是...
select nameid, string_agg(traffic,',' order by traffic) from dbscheme.test0001 group by nameid order by nameid ; 2.数组 select nameid, array_agg(traffic ) from dbscheme.test0001 group by nameid order by nameid ; 数组去重 、排序 ...
format格式化字符串,类似C语言的sprintf,其中n$表示第n个参数 select format('Hello %s, %1$s', 'World'); SELECT format('COMMENT ON TABLE "myschema"."%I" IS %L;','o_ls_test_1','测试表') SELECT format('INSERT INTO %I VALUES(%L)', 'Foo bar', E'O\'Reilly');...
2019-11-25 16:41 −之前的SQL基础1中已经介绍了部分Select的内容,但是,实际使用中select 还有很多其他的用法,本文会再介绍部分select的其他用法。 1. 去重查询 1.1 创建演示表 创建2张表用于演示,表名分别为student和class,后续也将继续用这2张表演示,2张表的数... ...
create view *** as select (column name),(),() from employee where (column = ?) order by (column name) tread; #十三、简单、批量数据插入,数据更新、删除操作,主键、外键 单表、指定字段insert 穷举字段内容,如果不存在也要用null表示 插入单个内容时,insert into (table name) values (column1,colu...