How to compare one table column names with other table rows value.

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SQL-Server-2012

i need to compare table-1 columns name with table-2 row values.

for example:-

Table-1 have 3 columns like :-

col-1 | col-2 | col-3

and Table-2 have one column with 3 row:-

col
----
col-1
col-2
col-3

now i need to compare table-1 column names with table-2 rows name. please any one help me?

What I have tried:

searching solution on google but not getting any solution right now.

Posted 25-Mar-20 21:34pm

TCS54321

Updated 25-Mar-20 23:42pm

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CHill60 · Answer 1 · 2020-03-25T23:43:00

The technique you need is UNPIVOT[^]

If you first cross join your tables

SQL

select *
	from table2
	cross join table1

You will get

col	col-1	col-2	col-3
col-1	1	2	3
col-2	1	2	3
col-3	1	2	3

As you can see - the values you want are across the top, but you want them in rows. So ..

SQL

select columnname, colvalue from
(select *
	from table2
	cross join table1
) src
unpivot (colvalue for columnname in ([col-1],[col-2],[col-3])) AS pvt

will give you

columnname	colvalue
col-1		1
col-1		1
col-1		1
col-2		2
col-2		2
col-2		2
col-3		3
col-3		3
col-3		3

Closer to what you want but you will need to use DISTINCT to get exactly what you need. I'll leave that as an exercise for you