How to write like in sql

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A little about the essay
An SQL Query is used to retrieve the required data from the database. However, there may be multiple SQL queries that yield the same results but with different levels of efficiency. An inefficient query can drain the database resources, reduce the database speed or result in a loss of service for other users. So it is very important to optimize the query to obtain the best database performance. Let us consider some sample tables to understand these different methods to optimize a query. Customers : Table Customers contains the details of the prospective customers for a shop.
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PostgreSQL LIKE

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How to Write T-SQL Queries Like a Pro – {coding}Sight

A JOIN clause is used to combine rows from two or more tables, based on a related column between them. The relationship between the two tables above is the "CustomerID" column. Insert the missing parts in the JOIN clause to join the two tables Orders and Customers , using the CustomerID field in both tables as the relationship between the two tables. Get certified by completing a course today!
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MySQL - LIKE Clause

The knowledge of SQL has always been in demand. Structured Query Language SQL is a programming language specific to a domain, designed to help maintain structured data held in a database. Basically, this language is what helps us communicate with a database, update it, and retrieve data from it.
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There are two wildcards often used in conjunction with the LIKE operator:. The following SQL statement selects all customers with a CustomerName that have "or" in any position:. The following SQL statement selects all customers with a CustomerName that have "r" in the second position:. The following SQL statement selects all customers with a CustomerName that starts with "a" and are at least 3 characters in length:. The following SQL statement selects all customers with a ContactName that starts with "a" and ends with "o":.
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