What is default behavior of PostgreSQL, if i don't specify collation externally? One of the main questions, is it case-sensitive or not?
PostgreSQL – Default Behavior Without Specifying COLLATION
collationpostgresql
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Best Answer
A collation is an SQL schema object that maps an SQL name to operating system locales. Whatever you shall setup as a default collation settings for the database. By default implicitly that collation will choose your database.
There are no case insensitive collations, but there is the citext extension.
The standard approach to doing case-insensitive matches in PostgreSQL has been to use the lower function when comparing values, for example
This works reasonably well, but has a number of drawbacks:
It makes your SQL statements verbose, and you always have to remember to use lower on both the column and the query value.
It won't use an index, unless you create a functional index using lower.
If you declare a column as UNIQUE or PRIMARY KEY, the implicitly generated index is case-sensitive. So it's useless for case-insensitive searches, and it won't enforce uniqueness case-insensitively.
From the documentation:
For your reference: PostgreSQL Documentation & StackOverFlow Ref Here