本文例項總結了MySQL子查詢操作。分享給大家供大家參考，具體如下：

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);

any some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_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),(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的供應商，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=107的供應商，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的供應商，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c0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】與前一個例子語句類似，但是在SELECT語句中使用NOT IN操作符

SELECT c_id FROM orders WHERE o_num NOT IN
(SELECT o_num FROM orderitems WHERE f_id = 'c0');

【例.60】在suppliers表中查詢s_city等於Tianjin的供應商s_id，然後在fruits表中查詢所有該供應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的供應商s_id，然後在fruits表中查詢所有非該供應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 suppliers AS s1 WHERE s1.s_city = 'Tianjin');

更多關於MySQL相關內容感興趣的讀者可檢視本站專題：《MySQL常用函式大彙總》、《MySQL日誌操作技巧大全》、《MySQL事務操作技巧彙總》、《MySQL儲存過程技巧大全》及《MySQL資料庫鎖相關技巧彙總》

希望本文所述對大家MySQL資料庫計有所幫助。