Jan 17, 2024 · 3 min read · SQL- UNION The UNION operator is like a tool that lets you bring together the results of two or more SELECT statements. Here are the rules for using UNION: Each SELECT statement involved must have the same number of columns. The columns must be...
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Jan 15, 2024 · 5 min read · SQL- GROUP BY The GROUP BY statement aggregates rows with identical values, summarizing them into groups, such as "determine the count of customers in each country." Typically, the GROUP BY statement is paired with aggregate functions (COUNT(), MA...
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Jan 4, 2024 · 3 min read · SQL- ORDER BY The ORDER BY keyword is used to sort rows based on a column value, in ascending or descending order. We use ASC to sort in ascending order and DESC to sort in descending order.If we leave it blank, then ORDER BY uses ASC by default. ...
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Jan 4, 2024 · 4 min read · SQL is an abbreviation for Structured Query Language. SQL allows you to connect to and manipulate databases. SQL was adopted as an American National Standards Institute (ANSI) standard in 1986 and as an International Organization for Standardization ...
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