SQL : SELECT COUNT(DISTINCT... ) error on multiple columns?

SQL : SELECT COUNT(DISTINCT... ) error on multiple columns?

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Fixing ORA-00979 Error in SQL: Mastering Multiple Counts and Group By
Fixing ORA-00979 Error in SQL: Mastering Multiple Counts and Group By
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Fixing ORA-00979 Error in SQL: Mastering Multiple Counts and Group By

Fixing ORA-00979 Error in SQL: Mastering Multiple Counts and Group By
SQL : Select distinct values from multiple columns in same table

SQL : Select distinct values from multiple columns in same table
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MySQL : SQL count how many times a value appears in multiple columns?
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Don’t Get Tricked by SQL COUNT! | COUNT vs COUNT(*) vs COUNT(DISTINCT)
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SQL : MySQL COUNT() multiple columns

SQL : MySQL COUNT() multiple columns
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DISTINCT Is NOT a Function | Why COUNT(DISTINCT) Gave Me a Different Answer | Snowflake SQL #9
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SQL : Need to select ALL columns while using COUNT/Group By
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How to using DISTINCT and NULL to SELECT Multiple Table in SQL SERVER with Transact SQL (T-SQL)
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SQL Server Tutorial | Count Rows by Year and Another Column Using GROUP BY
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Count duplicate occurrences in MYSQL table based on value in two columns using having and inner...
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Databases: Distinct column in an inner join query sql (2 Solutions!!)
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SQL Query Techniques: Using COUNT and DISTINCT in PostgreSQL
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#6: SELECT DISTINCT | SQL Tutorial