Jernaili Sadak 27 of 36 Allahabad 1 - Raza Ali Abidi - BBC URDU

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Jernaili Sadak 27 of 36 Allahabad 1 - Raza Ali Abidi - BBC URDU

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ASQL Join is an instruction to combine data from two sets of data (tables). SQL is a special-purpose programming language designed for managing information in a relational database management system (RDBMS). The word relational here is key; it specifies that the database management system is organized in such a way that there are clear relations defined between different sets of data. (sql jons description courtesy of   sql-joins ) Different Types of SQL JOINs: (INNER) JOIN: Returns records that have matching values in both tables LEFT (OUTER) JOIN: Return all records from the left table, and the matched records from the right table RIGHT (OUTER) JOIN: Return all records from the right table, and the matched records from the left table FULL (OUTER) JOIN: Return all records when there is a match in either left or right table image courtesy of   imgur
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