sql server - Inserting a character in the beginning of a string in SQL -

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i need change 'postalcode' column strings setting character 'a' @ beginning of string. i've tried this:

update customers set postalcode = stuff(postalcode , 0 , 1 , 'a')

but nothing... ideas?

you can try use concat

update customers set postalcode = concat('a', postalcode )

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