定義兩個表tb1和tb2
create table tbl1 ( num1 int not null);
create table tbl2 ( num2 int not null);
向兩個表中插入資料：
insert into tbl1 values(1), (5), (13), (27);
insert into tbl2 values(6), (14), (11), (20);
anysome關鍵字的子查詢
select num1
from tbl1
where num1 > any (select num2 from tbl2);
all關鍵字的子查詢
select num1
from tbl1
where num1 > all (select num2 from tbl2);
exists關鍵字的子查詢
select * from fruits
where exists
(select s_name from suppliers where s_id = 107);
select * from fruits
where f_price>10.20 and exists
(select s_name from suppliers where s_id = 107);
select * from fruits
where not exists
(select s_name from suppliers where s_id = 107);
帶in關鍵字的子查詢
select c_id
from orders
where o_num in (select o_num from orderitems where f_id = 'c0');
select c_id
from orders
where o_num not in (select o_num from orderitems where f程式設計客棧_id = 'c0');
帶比較運算子的子查詢
select s_id, f_name from fruits
where s_id =
(select s1.s_id from suppliers as s1 where s1.s_city = 'tianjin');
<>所有非
select s_id, f_name from fruits
where s_id <>
(select s1.s_id from suppliers as s1 where s1.s_city = 'tianjin');
定義兩個表tb1和tb2
create table tbl1 ( num1 int not null);
create table tbl2 ( num2 int not null);
向兩個表中插入資料
insert into tbl1 values(1), (5), (13), (27);
insert into tbl2 values(6), (14), (11), (20);
【例.53】返回tbl2表的所有 num2 列，然後將 tbl1 中的 num1 的值與之進行比較，只要大於 num2的任何值為符合查詢條件的結果
select num1
from tbl1
where num1 > any (select num2 from tbl2);
【例.54】返回tbl1表的中比tbl2表num2 列所有值都大的值
select num1
from tbl1
where num1 > all (select num2 from tbl2);
【例.55】查詢表suppliers表中是否存在s_id=107的**商，如果存在則查詢fruits表中的記錄
select * from fruits
where exists
(select s_name from suppliers where s_id = 107);
【例.56】查詢表suppliers表中是否存在s_id=sbdngzgpl107的**商，如果存在則查詢fruits表中的f_price大於10.20的記錄
select * from fruits
where f_price>10.20 and exists
(select s_name from suppliers where s_id = 107);
【例.57】查詢表suppliers表中是否存在s_id=107的**商，如果不存在則查詢fruits表中的記錄
select * from fruits
where not exists
(select s_name from suppliers where s_id = 107);
【例.58】在orderitems表中查詢訂購f_id為c0sbdngzgpl的訂單號，並根據訂單號查詢具有訂單號的客戶c_id
select c_id from orders where o_num in
(select o_num from orderitems where f_id = 'c0');
【例.59】與前乙個例子語句類似，但是在select語句中使用not in操作符
select c_id from orders where o_num n in
(select o_num from orderitems where f_id = 'c0');
【例.60】在suppliers表中查詢s_city等於tianjin的**商s_id，然後在fruits表中查詢所有該**商提供的水果的種類
select s_id, f_name from fruits
where s_id =
(select s1.s_id from suppliers as s1 where s1.s_city = 'tianjin');
【例.61】在suppliers表中查詢s_city等於tianjin的**商s_id，然後在fruits表中查詢所有非該**商提供的水果的種類，sql語句如下：
select s_id, f_name from fruits
where s_id <>
(select s1.s_id from supplisbdngzgplers as s1 where s1.s_city = 'tianjin');
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