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select case color
when 1 then 'red'
when 2 then 'green'
when 3 then 'blue'
else 'black'
end as 'colorName',
foodName from foods
Èç¹ûʹÓÃÁËleft joinµÄ時ºò£¬Ä³個columnµÄnullÖµÐèÒª給Ò»個default valueµÄ話£¬Ò²¿ÉÒÔÈçÏ£º
select foodName, case 
when foodPrice is null then 0
else foodPrice
end as price,
foodCost from foods left join foodPrices on foods.foodId = foodPrices.foodId
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when nullif(foodPrice, null) is null then 0


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select top 10 * from INFORMATION_SCHEMA.SCHEMATA
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select top 10 * from INFORMATION_SCHEMA.TABLES
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select top 10 * from INFORMATION_SCHEMA.COLUMNS
--VIEWS±í¸ø³öÁ˹ØÓÚÊý¾Ý¿âÖеÄÊÓͼµÄÐÅÏ¢
sel ......

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use pubs
go
--2.´ò¿ªÈ«ÎÄË÷ÒýÖ§³Ö
--execute sp_fulltext_database 'enable'
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