Python MySQL如何使用order by子句进行排序？

当我们必须将MySQL与其他编程语言一起使用时, 可以使用连接器。 MySQL-connector的工作是提供对使用所需语言的MySQL驱动程序的访问。因此, 它在编程语言和MySQL Server之间生成了连接。

OrderBy排序

OrderBy用于按升序或降序排列结果集。默认情况下, 除非提到" DESC"(以降序排列), 否则它始终以升序排列。

" ASC"也可以用于按升序明确排列。但是, 通常不会以这种方式进行操作, 因为默认情况下已经这样做了。

句法-

SELECT column1, column2
FROM table_name
ORDER BY column_name ASC|DESC;

以下程序将帮助你更好地理解这一点。

正在使用的数据库：

范例1：程序按名称升序排列数据

# Python program to demonstrate
# order by clause
  
  
import mysql.connector
  
# Connecting to the Database
mydb = mysql.connector.connect(
   host = 'localhost' , database = 'College' , user = 'root' , password = ''
)
  
cs = mydb.cursor()
  
# Order by clause
statement = "SELECT * FROM Student ORDER BY Name"
cs.execute(statement)
  
result_set = cs.fetchall()
  
for x in result_set:
     print (x)
      
# Disconnecting from the database
mydb.close()

输出如下：

范例2：按降序排列数据库

# Python program to demonstrate
# order by clause
  
  
import mysql.connector
  
# Connecting to the Database
mydb = mysql.connector.connect(
   host = 'localhost' , database = 'College' , user = 'root' , )
  
cs = mydb.cursor()
  
# Order by clause
statement = "SELECT * FROM Student ORDER BY Name DESC"
cs.execute(statement)
  
result_set = cs.fetchall()
  
for x in result_set:
     print (x)
    
# Disconnecting from the database  
mydb.close()

输出如下：

范例3：从表中获取名称的程序, 按卷号降序排列。

# Python program to demonstrate
# order by clause
  
  
import mysql.connector
  
# Connecting to the Database
mydb = mysql.connector.connect(
   host = 'localhost' , database = 'College' , user = 'root' , )
  
cs = mydb.cursor()
  
# Order by clause
statement = "SELECT Name FROM Student ORDER BY Roll_no DESC"
cs.execute(statement)
  
result_set = cs.fetchall()
  
for x in result_set:
     print (x)
      
# Disconnecting from the database
mydb.close()

输出如下：

首先, 你的面试准备可通过以下方式增强你的数据结构概念：Python DS课程。

---