常用SQL Server命令（持续） | Commonly used SQL Server command list (Cont')

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1. 查看某数据库中某表详细信息 SP_HELP

USE DB_NAME
GO
SP_HELP 'TABLE_NAME'

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2. 新建一个TABLE

USE DB_NAME
CREATE TABLE DimCountry
(
    CountryId INT PRIMARY KEY,
    CountryName NVARCHAR(50)
)

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3. 修改TABLE名字

EXEC SP_RENAME 'old_name','new_name';

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4. 修改TABLE，增加Column和Constraint

ALTER TABLE Table_Name
    ADD CountryId INT;
ALTER TABLE Table_Name
    ADD CONSTRAINT FK_CountryId FOREIGN KEY (CountryId) REFERENCES dbo.DimCountry(CountryId);

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5. 在删除DB的时候出现错误"SQL Server Cannot drop database <dbname> because it is currently in use"

USE master;
GO
ALTER DATABASE dbname SET SINGLE_USER WITH ROLLBACK IMMEDIATE;
GO
DROP DATABASE dbname;

比较简单粗暴的把当前数据库的改为single user,关闭其他的连接.再删除此数据库.

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6. 在WHERE子句中匹配包含某一字符串的sql语句

SELECT *
FROM Table_Name
Where Column_Name like '%search_string%'

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English Version

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1. Display the detail info of specified table at DB: SP_HELP

1 USE DB_NAME
2 GO
3 SP_HELP 'TABLE_NAME'

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2. Creat a new TABLE 

1 USE DB_NAME
2 CREATE TABLE DimCountry
3 (
4     CountryId INT PRIMARY KEY,
5     CountryName NVARCHAR(50)
6 )

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3. Alter TABLE Name

1 EXEC SP_RENAME 'old_name','new_name';

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4. Adding Column and Constraint while altering TABLE

1 ALTER TABLE Table_Name
2     ADD CountryId INT;
3 ALTER TABLE Table_Name
4     ADD CONSTRAINT FK_CountryId FOREIGN KEY (CountryId) REFERENCES dbo.DimCountry(CountryId);

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5. Occurred error "SQL Server Cannot drop database <dbname> because it is currently in use" whlile deleting a DB

1 USE master;
2 GO
3 ALTER DATABASE dbname SET SINGLE_USER WITH ROLLBACK IMMEDIATE;
4 GO
5 DROP DATABASE dbname;

Change the DB mode from multible user to single user, close other connections. Then remove the DB.

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6. Fuzzy lookup at WHERE clause

1 SELECT *
2 FROM Table_Name
3 Where Column_Name like '%search_string%'

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