本文例項總結了MySQL單表查詢常見操作。分享給大家供大家參考，具體如下：

建立fruits表：

CREATE TABLE fruits
(
 f_id  char(10)   NOT NULL,s_id  INT NOT NULL,f_name char(255)   NOT NULL,f_price decimal(8,2) NOT NULL,PRIMARY KEY(f_id)
) ;
INSERT INTO fruits (f_id,s_id,f_name,f_price)
VALUES('a1',101,'apple',5.2),('b1','blackberry',10.2),('bs1',102,'orange',11.2),('bs2',105,'melon',8.2),('t1','banana',10.3),('t2','grape',5.3),('o2',103,'coconut',9.2),('c0','cherry',3.2),('a2','apricot',2.2),('l2',104,'lemon',6.4),('b2','berry',7.6),('m1',106,'mango',15.6),('m2','xbabay',2.6),('t4',107,'xbababa',3.6),('m3','xxtt',11.6),('b5','xxxx',3.6);

常用查詢：

SELECT * FROM fruits;
select f_name,f_price from fruits;
select f_name,f_price from fruits where f_price=10.2;
select f_name,f_price from fruits where f_price<10;
select * from fruits where s_id in (101,102) order by f_name;
select * from fruits where s_id not in (101,102) order by f_name;
select f_name,f_price from fruits where f_price between 2.00 and 10.20;
select f_name,f_price from fruits where f_price not between 2.00 and 10.20;
select f_name,f_price from fruits where f_name like "b%";
select f_name,f_price from fruits where f_name like "%g%";
select f_name,f_price from fruits where f_name like "b%y";
select f_name,f_price from fruits where f_name like "____y";

建立customers表：

CREATE TABLE customers
(
 c_id   int    NOT NULL AUTO_INCREMENT,c_name  char(50) NOT NULL,c_address char(50) NULL,c_city  char(50) NULL,c_zip   char(10) NULL,c_contact char(50) NULL,c_email  char(255) NULL,PRIMARY KEY (c_id)
);
INSERT INTO customers(c_id,c_name,c_address,c_city,c_zip,c_contact,c_email)
VALUES(10001,'RedHook','200 Street ','Tianjin','300000','LiMing','[email protected]'),(10002,'Stars','333 Fromage Lane','Dalian','116000','Zhangbo','[email protected]'),(10003,'Netbhood','1 Sunny Place','Qingdao','266000','LuoCong',NULL),(10004,'JOTO','829 Riverside Drive','Haikou','570000','YangShan','[email protected]');

常用查詢語句：

select c_id,c_email from customers where c_email is null;
select c_id,c_email from customers where c_email is not null;
select f_name,f_price from fruits where s_id=101 and f_price>=5;
select f_name,f_price from fruits where s_id in (101,102) and f_price >=5 and f_name="apple";
select f_name,f_price from fruits where s_id=101 or s_id=102;

使用in操作更加簡潔明瞭

select f_name,f_price
from fruits
where s_id in (101,102);

欄位不重複

SELECT DISTINCT s_id FROM fruits;
select f_name from fruits ORDER BY f_name;

如果第一列資料中沒有相同值，將不再對第二列進行排序。

SELECT f_name,f_price
FROM fruits
ORDER BY f_name,f_price;

按價格降序排列,desc為降序，預設為升序。

SELECT f_name,f_price FROM fruits ORDER BY f_price desc;
SELECT f_name,f_price FROM fruits ORDER BY f_price desc,f_name;
SELECT s_id,COUNT(*) AS Total FROM fruits GROUP BY s_id;
SELECT s_id,GROUP_CONCAT(f_name) AS Names FROM fruits GROUP BY s_id;

使用having過濾分組

SELECT s_id,GROUP_CONCAT(f_name) AS Names
FROM fruits
GROUP BY s_id having count(f_name)>1;

在group by 子句中使用with rollup

SELECT s_id,COUNT(*) AS Total FROM fruits GROUP BY s_id WITH ROLLUP;
SELECT * from fruits group by s_id,f_name;

建立orderitems表：

CREATE TABLE orderitems
(
 o_num   int     NOT NULL,o_item   int     NOT NULL,f_id    char(10)   NOT NULL,quantity  int     NOT NULL,item_price decimal(8,PRIMARY KEY (o_num,o_item)
) ;
INSERT INTO orderitems(o_num,o_item,f_id,quantity,item_price)
VALUES(30001,1,'a1',10,(30001,2,'b2',3,'bs1',5,4,'bs2',15,(30002,'b3',20.0),(30003,'c0',100,10),(30004,'o2',50,2.50),(30005,'b1',8.99),'a2','m1',14.99);

常用查詢語句：

SELECT o_num,SUM(quantity * item_price) AS orderTotal
FROM orderitems
GROUP BY o_num
HAVING SUM(quantity*item_price) >= 100;
SELECT o_num,SUM(quantity * item_price) AS orderTotal
FROM orderitems
GROUP BY o_num
HAVING SUM(quantity*item_price) >= 100
order by ordertotal;
SELECT * From fruits LIMIT 8;

從第五行開始，讀取3行

SELECT * From fruits LIMIT 4,3;

【例.1】從fruits表中檢索所有欄位的資料

SELECT * FROM fruits;
SELECT f_id,f_price FROM fruits;

【例.2】查詢當前表中f_name列所有水果名稱，輸入如下語句：

SELECT f_name FROM fruits;

【例.3】例如，從fruits表中獲取f_name和f_price兩列，輸入如下語句：

SELECT f_name,f_price FROM fruits;

【例.4】查詢價格為10.2元的水果的名稱，輸入如下語句：

SELECT f_name,f_price
FROM fruits
WHERE f_price = 10.2;

【例.5】查詢名稱為“apple”的水果的價格,輸入如下語句：

SELECT f_name,f_price
FROM fruits
WHERE f_name = 'apple';

【例.6】查詢價格小於10的水果的名稱，輸入如下語句：

SELECT f_name,f_price
FROM fruits
WHERE f_price < 10;

【例.7】s_id為101和102的記錄，輸入如下語句：

SELECT s_id,f_price
FROM fruits
WHERE s_id IN (101,102)
ORDER BY f_name;

【例.8】查詢所有s_id不等於101也不等於102的記錄，輸入如下語句：

SELECT s_id,f_price
FROM fruits
WHERE s_id NOT IN (101,102)
ORDER BY f_name;

【例.9】查詢價格在2.00元到10.5元之間水果名稱和價格

SELECT f_name,f_price
FROM fruits
WHERE f_price BETWEEN 2.00 AND 10.20;

【例.10】查詢價格在2.00元到10.5元之外的水果名稱和價格

SELECT f_name,f_price
FROM fruits
WHERE f_price NOT BETWEEN 2.00 AND 10.20;

【例.11】查詢所有以‘b'字母開頭的水果，輸入如下語句：

SELECT f_id,f_name
FROM fruits
WHERE f_name LIKE 'b%';

【例.12】在fruits表中，查詢f_name中包含字母‘g'的記錄

SELECT f_id,f_name
FROM fruits
WHERE f_name LIKE '%g%';

【例.13】查詢以‘b'開頭，並以‘y'結尾的水果的名稱

SELECT f_name
FROM fruits
WHERE f_name LIKE 'b%y';

【例7.14】在fruits表中，查詢以字母‘y'結尾，且‘y'前面只有4個字母的記錄

SELECT f_id,f_name
FROM fruits
WHERE f_name LIKE '____y';

【例.15】查詢customers表中c_email為空的記錄的c_id、c_name和c_email欄位值：

SELECT c_id,c_email
FROM customers
WHERE c_email IS NULL;

【例.16】查詢customers表中c_email不為空的記錄的c_id、c_name和c_email欄位值

SELECT c_id,c_email
FROM customers
WHERE c_email IS NOT NULL;

【例.17】在fruits表中查詢s_id = ‘101'，並且f_price大於5的記錄價格和名稱

SELECT f_id,f_price,f_name
FROM fruits
WHERE s_id = '101' AND f_price >=5;

【例.18】在fruits表中查詢s_id = ‘101'或者'102'，並且f_price大於5，並且f_name='apple'的記錄價格和名稱

SELECT f_id,f_name
FROM fruits
WHERE s_id IN('101','102') AND f_price >= 5 AND f_name = 'apple';

【例.19】查詢s_id=101或者s_id=102的水果供應商的f_price和f_name，SQL語句如下：

SELECT s_id,f_price
FROM fruits
WHERE s_id = 101 OR s_id = 102;

【例.20】查詢s_id=101或者s_id=102的水果供應商的f_price和f_name

SELECT s_id,f_price
FROM fruits
WHERE s_id IN(101,102);

【例.21】查詢fruits表中s_id欄位的值，並返回s_id欄位值不得重複

SELECT DISTINCT s_id FROM fruits;

【例.22】查詢fruits表的f_name欄位值，並對其進行排序

select f_name from fruits ORDER BY f_name;

【例.23】查詢fruits表中的f_name和f_price欄位，先按f_name排序，再按f_price排序

SELECT f_name,f_price;

【例.24】查詢fruits表中的f_name和f_price欄位，對結果按f_price降序方式排序

SELECT f_name,f_price
FROM fruits
ORDER BY f_price DESC;

【例.25】查詢fruits表，先按f_price降序排序，再按f_name欄位升序排序，SQL語句如下：

SELECT f_price,f_name
FROM fruits
ORDER BY f_price DESC,f_name;

【例.26】根據s_id對fruits表中的資料進行分組

SELECT s_id,COUNT(*) AS Total
FROM fruits
GROUP BY s_id;

【例.27】根據s_id對fruits表中的資料進行分組，將每個供應商的水果名稱顯示出來

SELECT s_id,GROUP_CONCAT(f_name) AS Names
FROM fruits
GROUP BY s_id;

【例.28】根據s_id對fruits表中的資料進行分組，並顯示水果種類大於1的分組資訊

SELECT s_id,GROUP_CONCAT(f_name) AS Names
FROM fruits
GROUP BY s_id HAVING COUNT(f_name) > 1;

【例.29】根據s_id對fruits表中的資料進行分組，並顯示記錄數量

SELECT s_id,COUNT(*) AS Total
FROM fruits
GROUP BY s_id WITH ROLLUP;

【例.30】根據s_id和f_name欄位對fruits表中的資料進行分組， SQL語句如下，

SELECT * from fruits group by s_id,f_name;

【例.31】查詢訂單價格大於100的訂單號和總訂單價格

SELECT o_num,SUM(quantity * item_price) AS orderTotal
FROM orderitems
GROUP BY o_num
HAVING SUM(quantity*item_price) >= 100;

【例.32】顯示fruits表查詢結果的前4行，輸入如下語句：

SELECT * From fruits LIMIT 4;

【例.33】在fruits 表中，使用LIMIT子句，返回從第5個記錄開始的，行數長度為3的記錄

SELECT * From fruits LIMIT 4,3;

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。