table constraint or trigger?

by: Kenneth Osenbroch | last post by:

Hi. I want to create a trigger that only allows delete from table A if corresponding record in table B does not exist. Any idea on how this can be done? Thanks, Kenneth.

Oracle Database

How to force unique entries in a linking table?

by: grist2mill | last post by:

I have a table 'Group2Operation' that stores many to many relations between the 'Group' table and the 'Operation' table (each group is has permission to perform one or more of the available...

Microsoft SQL Server

good table design...

by: toedipper | last post by:

Hello, I am designing a table of vehicle types, nothing special, just a list of unique vehicle types such as truck, lorry, bike, motor bike, plane, tractor etc etc For the table design I am...

Microsoft SQL Server

Get next unique ID from a table before insert @@identity / Sequence

by: brent.ryan | last post by:

How do I get the next int value for a column before I do an insert in MY SQL Server 2000? I'm currently using Oracle sequence and doing something like: select seq.nextval from dual; Then I...

Microsoft SQL Server

Insert Trigger to Update table

by: takilroy | last post by:

Hi, Does anyone know of a simple way to do this? I want to create an insert trigger for a table and if the record already exists based on some criteria, I want to update the table with the...

Microsoft SQL Server

unique constraint to a column from another table

by: uw_badgers | last post by:

Is it possible to create a unique constraint to a column from another table? For example: tb_current: current_names -------------- aaa bbb tb_new:

Microsoft SQL Server

Updating another table using a trigger

by: Robert Fitzpatrick | last post by:

I am running PostgreSQL 7.4.5 and have a trigger on a table called tblriskassessors which inserts, updates or delete a corresponding record in tblinspectors by lookup of a contact id and license...

PostgreSQL Database

alter table nocheck constraint still some dependencies

by: Jeff Kish | last post by:

Hi. I'm getting errors like this when I try to run an upgrade script I'm trying to write/test: altering labels to length 60 Server: Msg 5074, Level 16, State 4, Line 5 The object...

Microsoft SQL Server

Should db2 allow this table to be created

by: Bernard Dhooghe | last post by:

Environment: DB2 UDB LUW 8.2 Following problem was submitted. create table t1 (c1 char(10) not null) insert into t1 values(default) This will result in (db2 command line):

DB2 Database

Trouble with Script - Adding column to current table.

by: Shestine | last post by:

I am trying to add a column to a current table, with data in it. I am only learning, and i have no idea how to change this to make it work. Here is the script I have right now it, but what it does is...

Microsoft SQL Server

How to turn on java script in a villaon keypad mobile phone

by: Charles Arthur | last post by:

How do i turn on java script on a villaon, callus and itel keypad mobile phone

Java

Looking to do Android software development, any suggestions? Is flutter better?

by: nemocccc | last post by:

hello, everyone, I want to develop a software for my android phone for daily needs, any suggestions?

General

Is that possible of reading the .csv file in column wise and the column have different lengths ?

by: Sonnysonu | last post by:

This is the data of csv file 1 2 3 1 2 3 1 2 3 1 2 3 2 3 2 3 3 the lengths should be different i have to store the data by column-wise with in the specific length. suppose the i have to...

C / C++

What is ONU?

by: marktang | last post by:

ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However,...

General

Changing the language in Windows 10

by: Hystou | last post by:

Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can...

Windows Server

The easy way to turn off automatic updates for Windows 10/11

by: Hystou | last post by:

Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows...

Windows Server

Discussion: How does Zigbee compare with other wireless protocols in smart home applications?

by: tracyyun | last post by:

Dear forum friends, With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each...

General

AI Job Threat for Devs

by: agi2029 | last post by:

Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing,...

Career Advice

Access Europe - Using VBA to create a class based on a table - Wed 1 May

by: isladogs | last post by:

The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new...

Microsoft Access / VBA

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