獲取一個表中的數據插入到另一個表
insert into studentsNew(id,name,sex,age) select id,name,sex,age from students where id between 30000 and 100000;
設置某列的默認值
alter table studentsNew alter column begindate set default 20171222;
alter table studentsNew alter column enddate set default 99991231;
更新原表關聯數據,插入新增數據(新表中少兩列字段)
UPDATE students tt set enddate=20171223 where exists(select * from stu ss where tt.id=ss.id);
alter table students alter column begindate set default 20171223;
alter table students alter column enddate set default 99991231;
insert into students(id,name,sex,age) select id,name,sex,age from stu;
select * from students st, stu ss
where st.id=ss.id
刪除表1中兩個表相同數據,再把表2數據全部插入到表1
DELETE from students tt WHERE exists(select * from stu ss where tt.id=ss.id);
insert into students(id,name,sex,age) select id,name,sex,age from stu;
查詢30000-100000中間數據
select * from students where id>30000 and id<100000
select * from students where id between 30000 and 100000
獲取一個表中的數據插入到另一個表
insert into studentsNew(id,name,sex,age) select id,name,sex,age from students where id between 30000 and 100000;
設置某列的默認值
alter table studentsNew alter column begindate set default 20171222;
alter table studentsNew alter column enddate set default 99991231;
查詢兩表的關聯數據
select * from studentsNew ss,stu_test tt where ss.id=tt.id
更新表一列的數據
update stu_test set begindate=20171223