SQL (Structured Query Language) is a programming language designed for managing and querying data in a relational database. SQL has a set of logics that can be used to filter, sort, and manipulate data. Here are some commonly used SQL logics:
SELECT: This is used to retrieve data from one or more tables. You can specify which columns to retrieve and use conditions to filter the results.
WHERE: This is used to filter the results based on one or more conditions. You can use operators like =, <, >, <=, >=, and <> to compare values.
AND/OR: These are used to combine multiple conditions. AND requires all conditions to be true, while OR requires at least one condition to be true.
ORDER BY: This is used to sort the results based on one or more columns. You can specify ASC (ascending) or DESC (descending) order.
GROUP BY: This is used to group the results based on one or more columns. You can use aggregate functions like COUNT, SUM, AVG, MIN, and MAX to perform calculations on the grouped data.
JOIN: This is used to combine data from two or more tables based on a related column.
UNION: This is used to combine the results of two or more SELECT statements.
HAVING: This is used to filter the results of a GROUP BY query based on aggregate function values.
These are just some of the SQL logics used to manipulate and query data in a relational database. There are many more functions and operators that can be used to perform complex data operations.
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