SQL Server : append string not working if col is empty -

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i need programatically append string col1. below code works in case col1 not empty. if it's empty after running code remains empty. why?

update      table set      col1 = col1 + ';somestring'      col2 = rowid

that's because operation null results in null. need use isnull() "transform" null values empty strings:

update      table set      col1 = isnull(col1, '') + ';somestring'      col2 = rowid

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