Find all columns in all tables that contain only null or empty strings

gistfile1.sql

declare @tempTable table
(
    TableSchema nvarchar(256),
    TableName nvarchar(256),
    ColumnName sysname,
    NotNullCnt bigint
);

declare @sql nvarchar(4000);
declare @tableSchema nvarchar(256);
declare @tableName nvarchar(256);
declare @columnName sysname;
declare @cnt bigint;

declare columnCursor cursor for
    select TABLE_SCHEMA, TABLE_NAME, COLUMN_NAME from INFORMATION_SCHEMA.COLUMNS
    where IS_NULLABLE = 'YES';

open columnCursor;

fetch next from columnCursor into @tableSchema, @tableName, @columnName;

while @@FETCH_STATUS = 0
begin
    -- use dynamic sql to get count of records where column is not null
    set @sql = 'select @cnt = COUNT(*) from [' + @tableSchema + '].[' + @tableName +
        '] where [' + @columnName + '] is not null and len(ltrim(rtrim([' + @columnName + ']))) > 0'
    print @sql

    exec sp_executesql @sql, N'@cnt bigint output', @cnt = @cnt output

	print @cnt

    insert into @tempTable select @tableSchema, @tableName, @columnName, @cnt;

    fetch next from columnCursor into @tableSchema, @tableName, @columnName;
end;

close columnCursor;
deallocate columnCursor;

select * from @tempTable where NotNullCnt = 0