sql server - Convert text into db object and field identifier -


given select statement lists tables , columns, how convert table , column names identifiers can used in seperate select statement?

in other words, if have string @table = 'person' , @column = 'name', want this:

select      datalength(max(t.@column)) longest,      datalength(min(t.@column)) shortest  @table t;

of course not accomplish want. want know length of longest , shortest string stored in column. if wanted information single column, there no need use these stringified-variables. want every (varchar) column across database. life short create every sql statement accomplish this. why want parametric mechanism specifying table , column. how fix achieve goal?

of course going wrong. perhaps should address each column index, , convert column name when output needed. thoughts?

declare @sql varchar(999) declare @col varchar(50) declare @table varchar(50)  set @col = <colname> set @table = <tablename>  set @sql = ' select  datalength(max(t.@column)) longest,  datalength(min(t.@column)) shortest  @table t'  set @sql = replace(replace(@sql, '@column', @col), '@table', @table)  exec(@sql)

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