The UNION operator in SQL is used to combine the results of two or more SELECT statements into a single result set. The UNION operator eliminates duplicates from the results and returns only unique rows. Syntax of SQL UNION Operator SELECT column1, column2, column3, … FROM table1 UNION SELECT column1, column2, column3, … FROM table2; […]
A SQL self join is a regular join, but the table is joined with itself. In other words, a self join is a query in which a table is joined with itself to find the relationships among its own rows. Syntax of SQL SELF JOIN SELECT column1, column2, column3, … FROM table1 t1 JOIN table1 […]
SQL FULL JOIN or SQL FULL OUTER JOIN is used to combine the results of both left join and right join, i.e. it returns all the rows from both tables where there is a match and also the unmatched rows from either of the tables. Syntax of SQL FULL JOIN SELECT column1, column2, column3, … […]
SQL RIGHT Join is a type of join in SQL (Structured Query Language) that combines rows from two or more tables based on a related column between them. The RIGHT Join returns all the rows from the right table (the second table in the query), and matching rows from the left table (the first table […]
SQL LEFT Join is a type of join in SQL (Structured Query Language) that combines rows from two or more tables based on a related column between them. The LEFT Join returns all the rows from the left table (the first table in the query), and matching rows from the right table (the second table […]
An Inner Join in SQL is a type of join operation that returns only the rows that have matching values in both tables. The Inner Join only returns the rows that satisfy the join condition, and discards any rows that do not meet the criteria. This makes it a useful tool for retrieving data that […]
SQL Joins are used to combine data from two or more tables based on a related column between them. Joining tables is an important operation in relational databases, as it allows you to retrieve data from multiple tables in a single query. This can help you to better organize and structure your data, and make […]
SQL Aliases are used to give temporary names to columns or tables in a query. Aliases are useful when working with large and complex queries, as they make it easier to read and understand the results. In addition, they also allow you to modify the appearance of the column names in the result set, making […]
The BETWEEN operator in SQL is used to select data within a specific range of values. It retrieves data where a specified column value is within a range of values specified in the BETWEEN clause. Syntax of SQL BETWEEN operator The syntax for using the BETWEEN operator is as follows: SELECT column_name(s) FROM table_name WHERE […]
The IN operator in SQL allows you to specify multiple values in a WHERE clause. It is used to compare a value to a set of values returned by a subquery or to a list of values specified in the IN clause. It returns true if the value matches one of the values in the […]
