How to remove duplicates with SQL?
Using GROUP BY with aggregate functions The GROUP BY clause, combined with other aggregate functions like MAX() , MIN() , or COUNT() , can help remove duplicate records from tables. The GROUP BY clause helps select specific records to retain while deleting other duplicates.
How to run SQL queries on CSV?
You can run SQL query on a CSV file:
- By importing a CSV file on SQL Online IDE.
- By importing a CSV file directly to Database.
- By using Python, R, or Julia Packages to run SQL directly on a CSV file.
- By using DuckDB, which is best for running fast analytical queries on large CSV files.
- By using CLI tools.
How to query deadlock in SQL?
To view deadlock information, the SQL Server Database Engine provides monitoring tools in the form of the system_health XEvent session, two trace flags, and the deadlock graph event in SQL Profiler.
How to run distinct in SQL?
The syntax for using DISTINCT is as follows: SELECT DISTINCT column1, column2, … FROM table_name WHERE condition; column1, column2, … : The column(s) from which you want to retrieve distinct values.