generate several lines of each row in a table

Hi all, consider the following data

with data1 as
(
  select 1 id, 0 cust_sh, null mx_sh, 123 cust_coll from dual union all
  select 2 id,0 cust_sh, 0 mx_sh, 0 cust_coll from dual union all
  select 3 id,456 cust_sh, 890 mx_sh, 123 cust_coll from dual 
),
data2 as
(
  select 'cust_sh' col_nm, 'ABC' nm from dual union all
  select 'mx_sh' col_nm, 'BDC' nm from dual union all
  select 'cust_coll' col_nm, 'HGR' nm from dual 
)

what I'm trying to do here is to join the two tables sort and produce this output

id  nm         amt
=====================
1   HGR        123
3   ABC        456
3   BDC        890
3   HGR        123

That's how I get this result. Data1 has lines with the ID and the columns with quantities such as cust_sh, etc.
data2 bearing the name of the column in data1 under col_nm and an additional column as nm.

for each line of Data1, I should take the amount column, look in database2 and the data1 amount is greater than 0.
then display the output.

for example, to get data1 row1. cust_sh is set to 0, so we don't look this column in Database2. mx_sh is set to null, which is not greater than 0, then us none.
cust_coll has the value 123 so we wait for this column in Database2. This is the third row in Database2. Therefore, view us the id and the amt of Data1 and data2 nm.

for line two of Data1, all after id columns are 0. don't have no need to display the output. only when the amount is greater than zero, we watch in Database2.

third row, cust sh has value 456 so we expect in database2 and we found in the first row. mx_sh has a value of 890 (greater than 0) so again once we look at Database2 and display the output.

can someone help me with a query that produces the output above?

Thanks in advance

OK, two more options:

WITH pivot_data1 AS (
  SELECT id, 'cust_sh' as col_nm, cust_sh as amt
  FROM data1
  WHERE cust_sh > 0
  UNION ALL
  SELECT id, 'mx_sh', mx_sh
  FROM data1
  WHERE mx_sh > 0
  UNION ALL
  SELECT id, 'cust_coll', cust_coll
  FROM data1
  WHERE cust_coll > 0
)
SELECT d1.id
     , d2.nm
     , d1.amt
FROM pivot_data1 d1
     JOIN data2 d2 ON d2.col_nm = d1.col_nm
;

WITH pivot_data1 AS (
  SELECT id
       , case i when 1 then 'cust_sh'
                when 2 then 'mx_sh'
                when 3 then 'cust_coll'
         end as col_nm
       , case i when 1 then cust_sh
                when 2 then mx_sh
                when 3 then cust_coll
         end as amt
  FROM data1
       CROSS JOIN ( SELECT level i FROM dual CONNECT BY level <= 3 )
)
SELECT d1.id
     , d2.nm
     , d1.amt
FROM pivot_data1 d1
     JOIN data2 d2 ON d2.col_nm = d1.col_nm
WHERE d1.amt > 0
;

Tags: Database

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