Michael.M的专栏

Those days, I worked on some SQL Server issue, and i fond that there have very powerful and useful command to get spid and database relation,that is SP_WHO;SP_WHObut this command is just a syste

Usually, we need to design SQL table manually, and we need define some columns with specified datatype for each column.but there always have some misunderstand for NVARCHAR column, we don't known ho