SQL : Why does postgres distinct assign a type to strings?

SQL : Why does postgres distinct assign a type to strings?

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Distinct Customer Cities | SQL Interview Question (DISTINCT) | GrowAsEngineers
Distinct Customer Cities | SQL Interview Question (DISTINCT) | GrowAsEngineers
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SQL Query Techniques: Using COUNT and DISTINCT in PostgreSQL

SQL Query Techniques: Using COUNT and DISTINCT in PostgreSQL
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How to Use DISTINCT ON with ORDER BY in PostgreSQL
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How to Use DISTINCT ON in Postgres to Select Maximum Value Rows
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How to apply distinct on multiple columns | PostgreSQL Tutorial
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Tansy SQL Course | DISTINCT | Chapter 7 | Lesson 4
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SQL Strings, Collation, Unicode and Booleans: VARCHAR vs TEXT, ICU, citext, IS TRUE (PostgreSQL)
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Distinct Select Statements in SQL
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Tutorial 13 – How to use Aliases (As Clause) in Postgres
Distinct Customer Cities | SQL Interview Question (DISTINCT) | GrowAsEngineers

Distinct Customer Cities | SQL Interview Question (DISTINCT) | GrowAsEngineers
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PYTHON : Selecting distinct column values in SQLAlchemy/Elixir
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SQL : How to use SELECT DISTINCT with RANDOM() function in PostgreSQL?
SQL : array of distinct values aggregated from an array column in Postgres

SQL : array of distinct values aggregated from an array column in Postgres