How I can update one table to another table ( msaccess)

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TABLE A   TABLE B
SLNO      SLNO
NAME      NAME

TABLE A RECORDS LIKE
1 THOMAS

TABLEB RECORDS LIKE
1 JOHN
2 THOMAS
3 JOSEPH
4 RAHULSir

I have two table ( TABLEA & TABLEB )

How i can transfer TableB to TableA ( duplicate entry avoid )

MY DATABASE MS ACCESS AND VB.NET

What I have tried:

INERT INTO TABLEA(SLNO) SELECT SLNO FROM TABLEB

Posted 4-Sep-21 3:59am

Member 13322574

Updated 4-Sep-21 5:19am

OriginalGriff

v2

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2 solutions

Solution 1

First select just the records you need to INSERT: because Access doesn't support the SQL EXCEPT clause, you need to use a LEFT JOIN:

SELECT A.x FROM A 
LEFT JOIN B 
ON A.x = B.x 
WHERE B.x IS NULL

Then you can just INSERT those into your TableA

Get the SELECT working first in a straight Access query, then add the INSERT to your VB code.

Posted 4-Sep-21 4:53am

OriginalGriff

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James Walsh Jr · Accepted Answer · 2021-09-04T05:19:00

You'll need to use a correlated 'Where Not Exists' clause to insert the data into [Table A] that doesn't exist in [Table B]. You'll also need to define a key to each table for the insert to work.

This should be pretty close to what you need for the insert statement.

SQL

INSERT INTO Table1 ( SLNO, Name )
SELECT t2.SLNO, t2.Name
FROM Table2 AS t2
WHERE (((Not Exists (SELECT 1
                      FROM Table1 as t1
                      WHERE t2.[SLNO] = t1.[SLNO] AND
                            t2.[Name] = t1.[Name]))=False));