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TRIM(SUBSTRING(customer_name, 1, INSTR(customer_name, ',') - 1)) AS last_name, TRIM(SUBSTRING(customer_name, INSTR(customer_name, ',') + 1, INSTR(customer_name ...
Learn how to master the SELECT statement to form truly useful data queries. This article explains functions, clauses, and keywords that will make your life a lot easier. Due to popular demand, we’re ...
In SQL, aggregate functions are used to calculate a set of values and return a single value. When using aggregate functions in SQL, it is crucial to understand column references. A column reference is ...
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