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  • SQL Server 基础语句学习(一)

    使用SQL Server 08

    1. Create Database 

    Create Database database_name

    2. Create Table

    Create Table table_name
    (column1_name Type, column2_name Type, …)

    Tips:
    (1). 选择database 并判断表如果已存在,删除原有表

    Use Database_name
    Go
    If exists (select * from sys.objects where object_id=OBJECT_ID(N'table_name') and type in (N'U'))
    Drop table table_name
    --Or 
    IF OBJECT_ID(N'tablename','U') IS NOT NULL
    DROP TABLE table_name
    
    Go
    Create Table table_name 
    (column1_name Type,
     column2_name Type,
     …)

    (2). 设主键, 联合主键

    Create Table table_name
    (column1_name Type, Not Null Primary Key,
     column2_name Type,
     …)
    
    Create Table table_name
    (column1_name Type Not Null,
      column2_name Type Not Null,
      …,
      Constraint constraint_name Primary Key (column1_name, column2_name)
     ) 

     3. Select 

    Select column_name(s) from table_name

    Tips:
    (1). 返回唯一值  Distinct

    Select distinct column_name from table_name

    (2).  排序 order by column_name, 升序 asc, 降序 desc

    Select * from table_name order by column1_name, column2_name desc 

    4. Insert into

    Insert into table_name (column_name, column_name) values (value, value)
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  • 原文地址:https://www.cnblogs.com/endless-on/p/3148125.html
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