When I perform SELECT * FROM table I got results like below: 1 item1 data1 2 item1 data2 3 item2 data3 4 item3 data4 As you can see, there are dup records from column2 (item1 are …

Oct 15, 2012 · I want to get the unique values from the following list:

The OP is asking about whether it is possible to add an Attribute to an Entity class for a Unique Key. The short answer is that it IS possible, but not an out-of-the-box feature from the EF Core …

Mar 19, 2019 · I have a form where a user can add multiple select boxes for multiple cities. The problem is that each newly generated select box needs to have a unique id. Can this be done …

I have an array of numbers that I need to make sure are unique. I found the code snippet below on the Internet, and it works great until the array has a zero in it. I found this other script here on

Dec 8, 2012 · How can I find the unique lines and remove all duplicates from a file? My input file is 1 1 2 3 5 5 7 7 I would like the result to be: 2 3 sort file | uniq will not do the job. Will show all val...

In the table, one customer like John Smith can have multiple addresses. I need the SELECT query for this table to return only first row found where there are duplicates in 'CName'. For …

Apr 20, 2009 · I want to have a unique constraint on a column which I am going to populate with GUIDs. However, my data contains null values for this columns. How do I create the constraint …

May 26, 2014 · What is the fastest / most efficient way of getting all the distinct items from a list? I have a List<string> that possibly has multiple repeating items in it and only want the …

Mar 7, 2023 · How to do validation with database like unique filed validation in nest JS using the class validator? I created a custom validation class and tried it. But userService was undefined …