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MySQL子查詢操作實(shí)例詳解

更新時(shí)間：2018年06月28日 09:40:41 作者：程志偉

這篇文章主要介紹了MySQL子查詢操作,結(jié)合實(shí)例形式較為詳細(xì)的分析了mysql表的創(chuàng)建、常見(jiàn)子查詢運(yùn)算與關(guān)鍵字使用技巧,需要的朋友可以參考下

本文實(shí)例總結(jié)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(gè)表tb1和tb2

CREATE table tbl1 ( num1 INT NOT NULL);
CREATE table tbl2 ( num2 INT NOT NULL);

向兩個(gè)表中插入數(shù)據(jù)：

INSERT INTO tbl1 values(1), (5), (13), (27);
INSERT INTO tbl2 values(6), (14), (11), (20);

any some關(guān)鍵字的子查詢

SELECT num1
FROM tbl1
WHERE num1 > ANY (SELECT num2 FROM tbl2);

all關(guān)鍵字的子查詢

SELECT num1
FROM tbl1
WHERE num1 > ALL (SELECT num2 FROM tbl2);

exists關(guān)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(guān)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(yùn)算符的子查詢

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(gè)表tb1和tb2

CREATE table tbl1 ( num1 INT NOT NULL);
CREATE table tbl2 ( num2 INT NOT NULL);

向兩個(gè)表中插入數(shù)據(jù)

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，然后將 tbl1 中的 num1 的值與之進(jìn)行比較，只要大于 num2的任何值為符合查詢條件的結(jié)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(yīng)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(yīng)商，如果存在則查詢fruits表中的f_price大于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(yīng)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(gòu)f_id為c0的訂單號(hào)，并根據(jù)訂單號(hào)查詢具有訂單號(hào)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(gè)例子語(yǔ)句類(lèi)似，但是在SELECT語(yǔ)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等于Tianjin的供應(yīng)商s_id，然后在fruits表中查詢所有該供應(yīng)商提供的水果的種類(lèi)

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等于Tianjin的供應(yīng)商s_id，然后在fruits表中查詢所有非該供應(yīng)商提供的水果的種類(lèi)，SQL語(yǔ)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(guān)于MySQL相關(guān)內(nèi)容感興趣的讀者可查看本站專(zhuān)題：《MySQL常用函數(shù)大匯總》、《MySQL日志操作技巧大全》、《MySQL事務(wù)操作技巧匯總》、《MySQL存儲(chǔ)過(guò)程技巧大全》及《MySQL數(shù)據(jù)庫(kù)鎖相關(guān)技巧匯總》

希望本文所述對(duì)大家MySQL數(shù)據(jù)庫(kù)計(jì)有所幫助。

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MySQL子查詢操作實(shí)例詳解

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