(N'tempdb..#REGISTRY', N'U') 这里面的这些符号都有什么意义呢？

Question

IF object_id(N'tempdb..#REGISTRY', N'U') IS NOT NULL
BEGIN
DROP TABLE #REGISTRY
END

IF object_id(N'tempdb..#OI', N'U') IS NOT NULL
BEGIN
DROP TABLE #OI
END

Answer 1

判断临时数据表REGISTRY是否存在