How can I check for duplicate nongroupable fields in a SOQL query?
30784
find duplicate records based on multiple fields
35011
How can I count the number of records that have a unique value in a particular field in ROR?
32335
How to get duplicate items from a list using LINQ?
69071
How to get the name of the relationship for inner queries in SOQL?
151233
Why are duplicates not being merged?
114337
How to check that SObject field is present in SOQL query
84100
Count the number of occurrences of a string in a VARCHAR field?
72701
How to emulate SOQL LIKE matching in Apex?
50105
Deleting duplicate rows with condition(Using SQL and LINQ)
57539
Deduplicate Data Using Having with Subquery
132105
What makes a field not groupable
32826
C# LINQ find duplicates in List
10409
How To Create A 'Two-Sided' Unique Index On Two Fields?
55676
SQL distinct for 2 fields in a database
46533
Duplicates of duplicates should be remapped
99147
Does JSON syntax allow duplicate keys in an object?
154901
Simple Linq query has duplicated join against same table?