打開查詢頁面
點擊已新建的數據庫，右鍵，然后點擊新建查詢。
寫入查詢語句
CREATE TABLE reader
(
read_id char(8) NOT NULL,
reader_name nvarchar(50) NOT NULL,
reader_sex char(2) NOT NULL,
reader_department nvarchar(60) NOT NULL
)
GO
插入一條記錄
其中jy是數據庫名稱,book是表名，注意插入的記錄要與表的結構一致。
use jy
go
insert into book values('b0001','sql寶典', '976-7-121-22013-5','廖夢依','電子工業出版社', 89,18)
查詢練習
SQL查詢
1.查詢讀者表reader的讀者姓名和所在系，要求查詢結果顯示為"姓名"和"院系"，按姓名排序.
select reader_name as 姓名, reader_department as 院系
from reader
order by 姓名
2.查詢讀者表reader中所有姓"李"的讀者的信息
select * from reader
where read_name like '李%'
3.分組查詢，查詢渡河表reader中各專業的男女人數.
select reader_department, reader_sex, count(*) as 人數
from reader
group by reader_department, reader_sex
4.查詢圖書價格超過電子工業出版社圖書平均單價的圖書信息
select book_name, book_author, book_publisher
from book
where book_price >
(select avg(book_price)
from book
where book_publisher='電子工業出版社')
5.查詢編號為"r0007"讀者的姓名，所在院系以及所借閱的圖書的書名(有三個表book,reader,record)
select reader_name, reader_department, book_name
from book,reader,record
where book.book_id = record.book_id and
reader.reader_id = record.reader_id adn
reader.reader_id = 'r0007'
6.創建視圖，用於查看借閱了圖書的讀者姓名,以及他們借閱的圖書名稱
create view v_record as
select reader_name, book_name
from reader,book,record
where book.book_id = record.book_id and
reader.reader_id=record.reader_id
接下來,
create view v_book as
select * from book where book_price < 30 with check option
7.創建索引,要提高按照讀者姓名查詢信息的速度，就必須要在讀者表reader的讀者姓名reader_name列上建立非聚力集索引i_name.
create nonclustered index i_name on reader(reader_name)