Scenario:
Is source table SourceData (Name, Number, Date)
Is existing table ProdData (ProdName, ProdNumber, CreatedDate)
Requirement:
Dont import from source if already exists in prod data!!!
Import rows from source to prod data, keep existing rows, append new ones, map columns like:
Output data example:
SourceData
Name | Number | Date
-----+--------+------
A | 1 | 2012
B | 2 | NULL
ProdData
ProdName | ProdNumber | CreatedDate
---------+------------+------------
Existing | 123 | 2018
A | 1 | 2012
B | 2 | 2020
Would something like this fit your needs?
INSERT ProdData (ProdName, ProdNumber, CreatedDate)
SELECT
SourceData.name as "ProdName",
SourceData.Number as "ProdNumber",
NVL(SourceData.Date,to_date(sysdate,'YYYY') as "CreatedDate"
FROM
SourceData
WHERE
NOT EXISTS (SELECT
1
FROM
ProdData PD2
WHERE
PD2.ProdName = SourceData.name
and PD2.ProdNumber = SourceData.Number
and NVL(PD2.CreatedDate,to_date(sysdate,'YYYY') = nvl(SourceData.Date,to_date(sysdate,'YYYY');
Another alternate option may be something like:
CREATE TABLE ProdData_new
WITH
(
DISTRIBUTION = HASH(ProdName)
, CLUSTERED INDEX (ProdNumber)
)
AS
SELECT
pdold.ProdName AS ProdName
, pdold.ProdNumber AS ProdNumber
, NVL(pdold.CreatedDate,to_date(sysdate,'YYYY')) AS CreatedDate
FROM
ProdData AS pdold
UNION
SELECT
sdold.name AS ProdName
, sdold.Number AS ProdNumber
, NVL(sdold.Date,to_date(sysdate,'YYYY') AS CreatedDate
FROM
SourceData AS sdold
;
--Optional Renaming of old tables
--RENAME OBJECT ProdData TO ProdData_old;
--RENAME OBJECT SourceData TO SourceData_old;
--RENAME OBJECT ProdData_new TO ProdData;
--DROP TABLE ProdData_old;
--DROP TABLE SourceData_old;
Or possibly something more like:
CREATE TABLE ProdData_new
( ProdName NVARCHAR NOT NULL
, ProdNumber INT NOT NULL
, CreatedDate INT NOT NULL)
WITH
( DISTRIBUTION = HASH(ProdName)
, CLUSTERED INDEX (ProdNumber) )
AS
SELECT
pdold.ProdName AS ProdName
, pdold.ProdNumber AS ProdNumber
, NVL(pdold.CreatedDate,to_date(sysdate,'YYYY')) AS CreatedDate
FROM
ProdData AS pdold
UNION
SELECT
sdold.name AS ProdName
, sdold.Number AS ProdNumber
, NVL(sdold.Date,to_date(sysdate,'YYYY') AS CreatedDate
FROM
SourceData AS sdold
;
--Optional Renaming of old tables
--RENAME OBJECT ProdData TO ProdData_old;
--RENAME OBJECT SourceData TO SourceData_old;
--RENAME OBJECT ProdData_new TO ProdData;
--DROP TABLE ProdData_old;
--DROP TABLE SourceData_old;
This is all somewhat guess work without knowing what you have tried, your specific syntax and your DB_Schema_Table setup.
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