sql server - How to turn separate year, month and day columns into a single date? -

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i have year column contains things 2013, 2012, etc. month column displays 1-12, , day column contains 1-31. need run select concatenates them , casts them actual date, unsure how go this. can provide input?

for sql server 2008+:

select convert(date,cast([year] varchar(4))+'-'+                     cast([month] varchar(2))+'-'+                     cast([day] varchar(2)))

for sql server 2005:

select convert(datetime,cast([year] varchar(4))+                         right('00'+cast([month] varchar(2)),2)+                         right('00'+cast([day] varchar(2)),2))

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