sql - Can I check if a variable is NULL within an Update's SET? -


i have stored procedure uses simple update variables passed it. don't want update fields when variables aren't null. statement looks like.

update mytable set mycolumn = @mycolumn,     mcolumn1 = @mycolumn1 mycolumn2 = @mycolumn2

is there anyway apply conditional logic within set? have around 10 fields need checked, wouldn't want update per field or that.

any ideas?

coalesce friend. returns first non-null argument. i'm not sure narrative way around want things, it's either:

update mytable set mycolumn = coalesce(mycolumn,@mycolumn),     mcolumn1 = coalesce(mycolumn1,@mycolumn1) mycolumn2 = @mycolumn2

which keeps current column's value if column's not null, or

update mytable set mycolumn = coalesce(@mycolumn,mycolumn),     mcolumn1 = coalesce(@mycolumn1,mycolumn1) mycolumn2 = @mycolumn2

which keeps current column's value if variable null.


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