PostgreSQL VAR_POP() and VAR_SAMP() Function | VAR_POP function | VAR_SAMP function in PostgreSQL

In this PostgreSQL tutorial, I have explained how to use the PostgreSQL VAR_POP() and VAR_SAMP() functions to calculate the population and sample data variance; these are aggregate functions. I have shown the syntax of the var_pop() and var_samp() functions with its definition. After that, I explained the var_pop() and var_samp() functions in PostgreSQL using an example.

1- What is the var_pop() function and its syntax with an example
2- What is the var_samp() function and its syntax with an example
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