Don't let two barcodes in column 1 without primary key?

Question

1.00/5 (1 vote)

See more:

Barcode Descriptions
111 - Redbull
112 - Vodka
112 - Vodka

How can I don't let two barcodes 112 and 112 in column 1 without primary key because I have done relationship with access.

What I have tried:

I tried to search in internet and not found, tried this code but not working for me.

Posted 12-Jul-16 10:37am

ionMEMBER

Updated 25-Jul-16 1:46am

v9

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[no name] 15-Jul-16 4:36am

How is about a unique index?

3 solutions

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Afzaal Ahmad Zeeshan · Answer 1 · 2016-07-12T11:24:00

Solution 1

For your case, you can see if there is a record with 112 as a value before adding 112 as column value in a new record.

SELECT Barcode WHERE Barcode = 112

This would do the trick. You can pass the 112 as a parameter (but that is a different story). Otherwise, in my own recommendation it is better to use a primary key and set that column to identity so that the database engine itself ensures that a duplicate data is not entered, and if that happens, an error is raised.

Posted 12-Jul-16 11:24am

Afzaal Ahmad Zeeshan

Comments

ionMEMBER 13-Jul-16 3:54am

Thanks for answere but I need a code for more barcodes and not one (112).
This code does not work for me.
You have any ideas?

Richard MacCutchan 13-Jul-16 4:49am

Do not use the hardcoded value, but the value entered by the user or device etc.

Afzaal Ahmad Zeeshan 13-Jul-16 6:27am

Do as Richard has said, I was just trying to avoid making this answer a very complex one. Otherwise, I could has shown you how to pass parameters. Parameters will have the values that would be used to check against the value. Have a look here on MSDN.

ProgrammingEnthusiast · Answer 2 · 2016-07-18T20:39:00

Solution 3

SELECT barcode
FROM TABLE1
GROUP BY barcode
HAVING barcode = Entered_Barcode

Posted 18-Jul-16 20:39pm

ProgrammingEnthusiast

Comments

ionMEMBER 19-Jul-16 15:47pm

Thanks.. :)
But where should I put this code?
In button1? because If I put this code in button1, I show more error:
-Statements and labels are not valid between 'Select Case' and first 'Case'.
-'Select Case' must end with a matching 'End Select'.
ETC.

ionMEMBER 21-Jul-16 19:21pm

Can you help me?

Patrice T · Answer 3 · 2016-07-13T09:24:00

Solution 2

Look at the usage of DISTINCT in SQL.
SQL SELECT DISTINCT Statement[^]

Posted 13-Jul-16 9:24am

Patrice T

Comments

ionMEMBER 13-Jul-16 16:10pm

Thanks but not with SQL. ACCESS ?

Patrice T 13-Jul-16 16:23pm

What is the problem with ACCESS ?
Use Improve question to update your question.

ionMEMBER 14-Jul-16 15:55pm

Its not problem. I make realationship with 4 tables on access and I do not want to do primary key for this table because my program not functioned with primary key. If there is any way to make the primary key without access? THANKS .