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declare @ProductName nvarchar(50)
declare pcurr cursor for select ProductName from Products
open pcurr
fetch next from pcurr into @ProductName
while (@@fetch_status = 0)
begin
print (@ProductName)
fetch next from pcurr into @ProductName
end
close pcurr
deallocate pcurr
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declare @ProductName nvarchar(50)
declare @ProductID int
select @ProductID=min(ProductID) from Products
while @ProductID is not null
begin
select @ProductName=ProductName from Products where
ProductID=@ProductID
print(@ProductName);
select @ProductID=min(ProductID) from Products where
ProductID>@ProductID
end
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int sqlite3_exec(sqlite3*£¬ const char *sql£¬ sqlite3_callbacksql Óï·¨
£¬ void *£¬  char **errmsg );
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Use equality first.
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Use range operators only where equality does not apply.
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Avoid use of negatives in the form of !=
or NOT.
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Avoid LIKE pattern matching.
±ÜÃâʹÓà LIKEÆ¥Åä
Try to retrieve specific rows and in small n ......

Oracle SQL Óï¾ä¶Ôʱ¼ä²Ù×÷µÄ×ܽá

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sysdate+(5/24/60/60)          ÔÚϵͳʱ¼ä»ù´¡ÉÏÑÓ³Ù5Ãë
sysdate+5/24/60               ÔÚϵͳʱ¼ä»ù´ ......

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1.bzscs(ɳ³æ ÎÒ°®Ð¡ÃÀ)Óú¯數µÄºÃ辦·¨:
CREATE    function [dbo].[calc_date](@time smalldatetime,@now smalldatetime)
returns nvarchar(10)
as
begin
declare @year int,@month int,@day int
select @year = datediff(yy,@time,@now)
if  (month(@now)=month(@time)) and (day ......
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