在插入记录之前，需要判断表是否为空，向大侠请教！！
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if (select count(*) from table)>0
begin
insert into .................
end
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select * from test
if @@rowcount >0
begin
insert test ..........
end
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if exists (select * from test)
begin
-----------
end
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if (select top 1 id from test) is null
begin
end