System.ListException: Before Insert or Upsert list must not have two identically equal elements for my DML operation
65406
System.ListException: Before Insert or Upsert list must not have two identically equal elements - Deep Dive
154262
List has no rows for assignment to SObject
17672
c# last insert id
29936
ListException: List index out of bounds: 0 for Custom Employee User account
18188
Is there a no-duplicate List implementation out there?
66402
Insert error, Incorrect syntax near '2'
28203
System.QueryException: List has no rows for assignment to SObject
25912
Why does adding a new value to list overwrite previous values in the list
61624
How to merge 2 List and removing duplicate values from it in C#
36268
Insert multiple rows WITHOUT repeating the "INSERT INTO ..." part of the statement?
74192
Is storing a delimited list in a database column really that bad?
110505
lead conversion trigger causing issue when multiple lead records are inserted
32335
How to get duplicate items from a list using LINQ?
130341
SQL Insert Statement Persists Two Records When I Need Just One
83365
Insert issue with arrays
87388
How to Count Duplicates in List with LINQ
149172
Java: Avoid inserting duplicate in arraylist