📄 数据检索.sql
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use northwind
select productid,productname,supplierid,categoryid from products
select productid,productname from products
where productid=5
select * from [order details]
where orderid >= 10256
select * from products
where productname like 'qu%' or productname like'ch%'
select * from products
where productid in(1,2,3,4,5,6,8,9,10,11)and productname like 'c%'
select * from products
where productid between 1 and 5
select * from products
where productid in(1,5,6)
select * from suppliers
where fax is null and region is null and homepage is null
select* from suppliers
where fax is not null
select distinct region from suppliers
order by region
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