# How to get the desired result when subsequent month is not available

```WITH T1
AS (SELECT 'A' COL1,
'B' COL2,
'C' COL3,
'01-Jan-2015' DT,
10 QTY
FROM DUAL
UNION
SELECT 'A' COL1,
'B' COL2,
'C' COL3,
'01-feb-2015' DT,
20 QTY
FROM DUAL
UNION
SELECT 'A' COL1,
'B' COL2,
'C' COL3,
'01-mar-2015' DT,
30 QTY
FROM DUAL
UNION
SELECT 'A' COL1,
'B' COL2,
'C' COL3,
'01-may-2015' DT,
40 QTY
FROM DUAL
UNION
SELECT 'A1' COL1,
'B1' COL2,
'C1' COL3,
'01-mar-2015' DT,
40 QTY
FROM DUAL
UNION
SELECT 'A1' COL1,
'B1' COL2,
'C1' COL3,
'01-may-2015' DT,
40 QTY
FROM DUAL)
SELECT *
FROM t1

```

Current output:

 COL1 COL2 COL3 DT QTY. A B C January 1, 2015 10 A B C February 1, 2015 20 A B C 01-mar-2015 30 A B C 01-may-2015 40 A1 B1 C1 01-mar-2015 40 A1 B1 C1 01-may-2015 40

Expected results

 COL1 COL2 COL3 DT QTY. DT REQ_VAL A B C 01/01/2015 10 01/01/2015 20 A B C 01/02/2015 20 01/02/2015 30 A B C 01/03/2015 30 01/03/2015 0 A B C 01/05/2015 40 01/05/2015 0 A1 B1 C1 01/03/2015 40 01/03/2015 0 A1 B1 C1 01/05/2015 40 01/05/2015 0

Logic:

If we COL1, COL2, COL3 combination for A, B, C, we have the quantity for 1 January, 1 February, 1 March, 1 may, and we don't have quantity for April 1 and June 1. I need following QUANTITY value as another column. If I use the lead, I'll get the value from May 1st to March 1st, but I want to value 0 because it is after March either.

What I've tried so far:

```SELECT *
FROM (WITH T1
AS (SELECT 'A' COL1,
'B' COL2,
'C' COL3,
'01-Jan-2015' DT,
10 QTY
FROM DUAL
UNION
SELECT 'A' COL1,
'B' COL2,
'C' COL3,
'01-feb-2015' DT,
20 QTY
FROM DUAL
UNION
SELECT 'A' COL1,
'B' COL2,
'C' COL3,
'01-mar-2015' DT,
30 QTY
FROM DUAL
UNION
SELECT 'A' COL1,
'B' COL2,
'C' COL3,
'01-may-2015' DT,
40 QTY
FROM DUAL)
SELECT COL1,
COL2,
COL3,
TO_DATE (T1.DT) DT,
NVL (QTY, 0) QTY,
MONTHS.DT ALL_DATES,
LEAD (NVL (QTY, 0), 1, 0) OVER (ORDER BY MONTHS.DT) REQ_VAL
FROM T1,
(    SELECT ADD_MONTHS (TO_DATE ('01-jun-2015'), LEVEL - 6) DT
FROM DUAL
CONNECT BY LEVEL <= 12) MONTHS
WHERE MONTHS.DT = T1.DT(+))
WHERE DT ISNOTNULL;

```

My query works for a set of COL1, COL2, COL3, am looking how we can achieve multiple COL1, COL2, COL3 (or) otherwise better query writing.

Thank you

WITH T1

AS (SELECT 'A' COL1,)

'B' COL2,

COL3 'C ',.

To_date('01-Jan-2015','dd-mon-yyyy') DT,

QTY 10

OF THE DOUBLE

UNION

SELECT 'A' COL1,

'B' COL2,

COL3 'C ',.

To_date('01-Feb-2015','dd-mon-yyyy') DT,

QTY. 20

OF THE DOUBLE

UNION

SELECT 'A' COL1,

'B' COL2,

COL3 'C ',.

To_date('01-Mar-2015','dd-mon-yyyy') DT,

QTY 30

OF THE DOUBLE

UNION

SELECT 'A' COL1,

'B' COL2,

COL3 'C ',.

To_date('01-May-2015','dd-mon-yyyy') DT,

QUANTITY 40

OF THE DOUBLE

UNION

SELECT 'A1' COL1,

COL2 "B1."

COL3 "C1"

To_date('01-Mar-2015','dd-mon-yyyy') DT,

QUANTITY 40

OF THE DOUBLE

UNION

SELECT 'A1' COL1,

COL2 "B1."

COL3 "C1"

To_date('01-May-2015','dd-mon-yyyy') DT,

QUANTITY 40

THE DOUBLE)

X.Col1, x.col2, x.col3, x.dt, x.qty, NVL(y.qty,0) SELECT req_val

THE t1 x

LEFT OUTER JOIN t1 y

ON y.col1 = x.col1

AND y.col2 = x.col2

AND y.col3 = x.col3

ORDER BY 1,2,3,4

My query works for a DFU, am looking how we can achieve multiple UTD

What is a DFU?

Tags: Database

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