Part 1 Connecting to SQL Server using SSMS
note that,SSMS is a client tool and not the server by itself,it is a developer machines connects to SQL Server.
Part 2 Creating altering and dropping a database
you cannot drop a database , if it is currently in use you will get an error stating. so , if other users are connected, you need to put the database in single user node and then drop the database.system database cannot be dropped.
Part 3 Creating and working with tables
for example:add a foreignkey relation.
table:Student:ID,GenderID;
Gender:ID,StudentID;
Alter table Student Add Constraint Student_GenderID_FK FOREIGN KEY (GenderID) references Gender (ID)
Syntax :
Alter table 外键表名 add constraint 外键约束名
FOREIGN KEY (外键名) references 主表名 (主键名)
Note:Foreign Keys are used to enforce(强制) database integrity(完整) . In layman‘s terms(一般来说), A foreign key in one table points to a primary key in another table. The foreign key constraint prevents invalid data form being inserted into the foreign key column. The values that you enter into the foreign key column, has to be one of the values contained in the table it points to.
Part 4 Adding a default constraint
Altering an existing column to add a default constraint:
ALTER TABLE 表名
ADD CONSTRAINT 约束名
DEFAULT 默认值 FOR 列名
Adding a new column with default value, to an existing table:
ALTER TABLE 表名
ADD 列名 数据类型 是否允许null
CONSTRAINT 约束名 DEFAULT 默认值
Dropping a constraint:
ALTER TABLE 表名
DROP CONSTRAINT 约束名
Part 5 Cascading referential integrity constraint
Part 6 Adding a check constraint
Part 7 Identity Column in SQL Server
Part 8 How to get the last generated identity column value in SQL Server
Part 9 Unique key constraint
Part 10 Select statement in sql server
Select specific or all columns
select * from 表名
select 列名，列名... from 表名
Distinct rows
select distinct 列名 from 表名
Filtering with where clause(子句)
Wild Cards in SQL Server
Joining multiple conditions using AND and OR operators
Sorting rows using order by
Selecting top n or top n percentage of rows
