if statement

[simma]

hello
How do I frame if statement in sql.I want to execute some statemnts if @a=0 and some if @a=1.

 

[fluteplr]

if @a = 0
begin
do some stuff here
end
if @a = 1
begin
do some stuff here
end

 

[simma]

Thanks
I already tried it
Its checking for first statement but if its false,its not going to second but giving error there.