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SQL Day 5: UNION, UNION ALL, Data Type Changes, and CAST in PostgreSQL
Introduction Today’s SQL learning session covered important concepts like UNION, UNION ALL, data type changes in PostgreSQL, and CAST operations. These topics are crucial when handling large datasets, managing data types, and ensuring accurate data retrieval. Additionally, I attended a test in my classroom, where I encountered some challenging SQL queries, which I’ll also discuss in this blog. 1. UNION vs UNION ALL in PostgreSQL Both UNION and UNION ALL are used to combine results from multiple SELECT queries, but they behave differently when handling duplicate values.
Introduction
Today’s SQL learning session covered important concepts like UNION, UNION ALL, data type changes in PostgreSQL, and CAST operations. These topics are crucial when handling large datasets, managing data types, and ensuring accurate data retrieval. Additionally, I attended a test in my classroom, where I encountered some challenging SQL queries, which I’ll also discuss in this blog.
1. UNION vs UNION ALL in PostgreSQL
Both UNION and UNION ALL are used to combine results from multiple SELECT queries, but they behave differently when handling duplicate values.
