What is difference between union and MINUS in SQL?

The Minus operator returns only the distinct rows from the first table. It is a must to follow the above conditions that we’ve seen in the union, i.e., the number of fields in both the SELECT statements should be the same, with the same data type, and in the same order for the minus operation.

What is Union MINUS and interact commands SQL?

The UNION operator is used to combining the results of two tables, and it eliminates duplicate rows from the tables. The MINUS operator is used to returning rows from the first query but not from the second query.

What is opposite of union in SQL?

INTERSECT returns distinct rows that are output by both the left and right input queries operator. To combine the result sets of two queries that use EXCEPT or INTERSECT, the basic rules are: The number and the order of the columns must be the same in all queries. The data types must be compatible.

What is different between UNION and MINUS?

The most commonly used command, UNION combines the two answer sets into a single answer set. It automatically removes duplicate rows from the results. MINUS gives you the rows that are found in the first query and not in the second query by removing from the results all the rows that are found only in the second query.

What is the use of MINUS in SQL?

A Minus Query is a query that uses the MINUS operator in SQL to subtract one result set from another result set to evaluate the result set difference. If there is no difference, there is no remaining result set. If there is a difference, the resulting rows will be displayed.

What do the INTERSECT and minus clauses do?

SQL INTERSECT and MINUS are useful clauses for quickly finding the difference between two tables and finding the rows they share. INTERSECT compares the data between tables and returns only the rows of data that exist in both tables. A great way to start learning SQL is with an online SQL course.

How does PL SQL work?

PL/SQL includes procedural language elements such as conditions and loops. It allows declaration of constants and variables, procedures and functions, types and variables of those types, and triggers. It can handle exceptions (run-time errors). Arrays are supported involving the use of PL/SQL collections.

What is query for second highest salary?

We can nest the above query to find the second largest salary. select *from employee group by salary order by salary desc limit 1,1; There are other ways : SELECT name, MAX(salary) AS salary FROM employee WHERE salary IN (SELECT salary FROM employee MINUS SELECT MAX(salary) FROM employee);

What is difference between UNION and intersect?

The union of two sets contains all the elements contained in either set (or both sets). The intersection of two sets contains only the elements that are in both sets. The intersection is notated A ⋂ B.

What does MINUS do in SQL?

The SQL MINUS operator is used to return all rows in the first SELECT statement that are not returned by the second SELECT statement. Each SELECT statement will define a dataset. The MINUS operator will retrieve all records from the first dataset and then remove from the results all records from the second dataset.

Can SQL do calculations?

Does SQL Server perform basic mathematical calculations? Yes – SQL Server can perform basic addition, subtraction, multiplication and division. In addition, SQL Server can calculate SUM, COUNT, AVG, etc. For these type of calculations, check out SQL Server T-SQL Aggregate Functions.

When to use Union all or minus in SQL?

The MINUS, UNION and INTERSECT operators will always sort the returned results; UNION ALL will not. If we want a certain sort order or type, we can always use an ORDER BY at the end of the query. But keep in mind that this will sort the whole query! We can’t use ORDER BY before a SQL set operator or try to sort every SELECT separately.

How is the minus set operator used in SQL?

The MINUS set operator is designed for this type of task. Now “Harry Potter” doesn’t appear in the results table; it’s the title of a book and a movie. Thanks to the MINUS set operator we are able to see only those titles that occur in the first table and are not present in the second.

When to use the Union operator in SQL?

The union operator combines two or more tables into a single result set. To use it, the tables must have the same number of columns with matching data types in each position. The brick collection tables have different columns. So combining these with select * leads to an error:

Can a union intersect and minus be used on a long column?

The UNION, INTERSECT, and MINUS operators are not valid on LONG columns. If the select list preceding the set operator contains an expression, then you must provide a column alias for the expression in order to refer to it in the order_by_clause.