update columns when value is numeric in tsql

Posted by knittl on Stack Overflow See other posts from Stack Overflow or by knittl
Published on 2010-05-26T09:59:46Z Indexed on 2010/05/26 10:01 UTC
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string

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datetime

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update

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boolean

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mssql

i want to normalize date fields from an old badly designed db dump. i now need to update every row, where the datefield only contains the year.

update table set date = '01.01.' + date
where date like '____' and isnumeric(date) = 1 and date >= 1950

but this will not work, because sql does not do short circuit evaluation of boolean expressions. thus i get an error "error converting nvarchar '01.07.1989' to int"

is there a way to work around this? the column also contains strings with a length of 4, which are not numbers (????, 5/96, 70/8, etc.) the table only has 60000 rows

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