Oct 16, 2025 · 3 min read · SQL set operations combine the results of two or more SELECT statements into a single result set. These operators are similar to mathematical set theory concepts and are used to merge, find commonalities, or identify differences between data sets. Fo...
Join discussionOct 12, 2025 · 2 min read · Introduction A disjoint set is a data structure that helps determine if two nodes are part of the same component efficiently. While BFS or DFS can be used to check this, a disjoint set can perform the task in constant time. It is particularly useful ...
Join discussionJul 24, 2025 · 2 min read · When merging results in SQL, the UNION operator often gets the spotlight. But what if you want every single row—including duplicates? Enter UNION ALL. It’s faster, simpler, and ideal when duplication is not an issue but a feature. Here's how it works...
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Jul 20, 2025 · 2 min read · SQL gives us tools not just to query data, but also to combine it across tables and filters. The UNION operator helps you merge the results of multiple SELECT statements into one cohesive set. Whether you’re working with partitioned tables or pulling...
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Oct 29, 2024 · 5 min read · Have you ever tried to combine pieces of information from different sources? Maybe you have a list of your friends and another list of their favorite games. You might want to see who likes which game. In databases, we use something called joins to co...
Join discussionDec 19, 2023 · 1 min read · Unions in C are user-defined data types that allow different data members to share the same memory space. They are particularly useful when dealing with situations where different data members need to occupy the same memory space at different times, ...
Join discussionDec 9, 2023 · 1 min read · 대수 타입(Algebraic type) 대수 타입이란 여러개의 타입을 합성해서 만드는 타입을 말한다. 합집합(Union) 타입 let a: string | number | boolean; a = 1; a = "hello"; a = true; Union 타입으로 배열 타입 정의하기 let arr: (number | string | boolean)[] = [1, "hello", true]; Union 타입과 객체 타입 type Dog = ...
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Aug 30, 2023 · 4 min read · In today's world, how do we make payments? What do we use to make payments? What do we do to take out loans? How do we repay loans? We are at the mercy of traditional banks and their systems for facilitating each one of these. But are they always saf...
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Sep 5, 2022 · 2 min read · User-Defined Derived Data types There are some derived data types that are defined by the user. These are class , structure , union and enumeration. Class A class represents a group of similar objects. To represent classes , it offers a user-def...
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