Question

I have two variables like:

@FieldName 
@values

Those two variables hold values like:

• @FieldName – contains [a],[b],[c],[d]
• @values – contains 5,6,7,8

Now I need to retrieve the data of column 'b' & 'd' only.

How can we get b=6 & d=8?

Thanks in advance.

Answer 1

well I hate to do such a things on SQL Server, but

declare @FieldName nvarchar(max) = '[a],[b],[c],[d]'
declare @values nvarchar(max) = '5,6,7,8'
declare @i int, @j int, @break int
declare @a nvarchar(max), @b nvarchar(max), @result nvarchar(max)

select @break = 0

while @break = 0
begin
    select @i = charindex(',', @FieldName), @j = charindex(',', @values)

    if @i > 0 and @j > 0
    begin
        select @a = left(@FieldName, @i - 1), @b = left(@values, @j - 1)

        select @FieldName = right(@FieldName, len(@FieldName) - @i), @values = right(@values, len(@values) - @j)
    end
    else
    begin
        select @a = @FieldName, @b = @values, @break = 1
    end

    if @a in ('[b]', '[d]')
        select @result = isnull(@result + ' & ', '') + @a + '=' + @b

end

select @result

You can also put all this list into temporary/variable table and do join.

select *
from
(
    select T.<yourcolumn>, row_number() over (order by T.<yourcolumn>) as rownum
    from <temptable1> as T
) as F
    inner join
    (
        select T.<yourcolumn>, row_number() over (order by T.<yourcolumn>) as rownum
        from <temptable2> as T
    ) as V on V.rownum = F.rownum

Or, even better, you can pass parameters into sp in xml form and not in distinct lists