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In SQL, the RIGHT JOIN (also called RIGHT OUTER JOIN) is an essential command used to combine data from two tables based on a related column. It returns all records from the right table, along with the matching records from the left table. If there is no matching record in the left table, SQL will r
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BetaFields in SQL. Fields are basically columns in a table with specific information about the data. Consider the snapshot below. There is an e_salary field in the table that provides information about the salaries of different employees. Similarly, the e_age field provides information about the age of different employees.
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BetaWhile standard SQL is widely used, specific dialects like T-SQL by Microsoft SQL Server and PL/SQL by Oracle offer extensions to enhance procedural programming capabilities. SQL is known for its create, read, update and delete functions and its nonprocedural nature makes it accessible even to those with limited programming experience, often making it an easy language for beginners.
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BetaSQL dialects, such as PostgreSQL, MySQL, SQLite, and SQL Server, each have unique syntax elements that are compatible with their corresponding RDBMS. Learning a dialect like PostgreSQL, which closely follows standard SQL syntax, is a great starting point for learning SQL , making it easier to adapt to other dialects and database systems.
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BetaOne of the tables called Song has the fields Title, Artist, Genre and Length A band called RandomBits removes their permission for their songs to be streamed. The company removes all the songs belonging to RandomBits from their service. Write an SQL statement that will remove all songs by RandomBits from the table Song [2]
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BetaThe SQL subquery is a SELECT query that is embedded in the main SELECT statement. The subquery can be nested inside a SELECT, INSERT, UPDATE, or DELETE statement or inside another subquery. ... The subquery (also called the 'inner query') is the query inside the parentheses. See the following code and query result : SQL Code:
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BetaThe SQL Table variable is used to create, modify, rename, copy and delete tables. Table variable was introduced by Microsoft. It was introduced with SQL server 2000 to be an alternative of temporary tables. It is a variable where we temporary store records and results. This is same like temp table but in the case of temp table we ...
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BetaIts is used to fetch or retrieve records/data-rows from data table according to the condition/requirement.SQL Keys are also used to create relationship among different database tables. ... It is a super key with no repeated data is called a candidate key. Example. Emp_Id is the candidate key for relation Employee. 2. Primary Key
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BetaRelationships in SQL tables define how tables are connected to one another. Building relationships in tables helps to organize and link data across multiple tables. Creating relationships among tables provides efficient data retrieval and maintenance.. In this article, we will learn about relationships in SQL, and look at its types like one-to-one, one-to-many, many-to-many, etc.
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BetaTypes of Views. Simple View: A view based on only a single table, which doesn't contain GROUP BY clause and any functions. Complex View: A view based on multiple tables, which contain GROUP BY clause and functions. Inline View: A view based on a subquery in FROM Clause, that subquery creates a temporary table and simplifies the complex query. ...
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