Get yourself a FREE white paper with practical examples of Oracle queries. The basics of the SQL statements in Oracle This white paper will come in handy for Oracle developers who want to improve their skills in writing some basic queries. The document also delivers some tips and tricks, which...
UNION: Union operation combines results from two queries, and removes duplicates. MINUS: Minus operation returns rows from the first query that are not in the second query. INTERSECT: Intersect returns rows that are common to both queries. 16. What is a subquery? A subquery is a query nested...
The UNION keyword is used in SQL for combining multiple SELECT queries but deletes duplicates from the result set. The INTERSECT keyword is only used for retrieving common rows using SELECT queries between multiple tables. The MINUS keyword essentially subtracts between two SELECT queries. The resul...
http://www.dotnetfunda.com/articles/show/3515/some-basic-sql-queries-which-should-be-practiced-before-going-to-inter Describe the topic with code snippets Hi guys, in this article we will look into some SQL Server queries which you should prepare before going to your interview. B...
TCL –Transaction Control Language– deals with the transaction within the database. 7. What is a Query? A query, in SQL, is a command used to request data or update information from a database table or combination of tables. Users can write and execute queries to retrieve, delete or upd...
Never concatenate user inputs directly into queries. 5) What is ACID in SQL Transactions? ACID properties ensure reliability in database transactions: Atomicity: Transactions are all-or-nothing. Consistency: Ensures database integrity before and after a transaction. ...
GROUP BY: Groups rows with similar values. HAVING: Filters grouped rows. LIMIT(or TOP): Limits the number of rows returned. DISTINCT: Retrieves unique values. JOIN: Combines rows from multiple tables. UNION(and UNION ALL): Combines results from multiple queries. ...
Master SQL with our tutorial designed for both beginners and experienced. Learn from basic queries to advanced database management techniques through practical examples.
3 answersOne of the answers was accepted by the question author. Sortable MVC Tables with Stored Procedure Hello everyone and thanks for the help in advance. I am developing a MVC application that requires a sortable table. The issue is that the tables utilize queries that are best suited for...
Cross Join will return all records where each row from the first table is combined with each row from the second table. SQL Interview Questions and answers on Database Views 47. What is a view? Views are virtual tables. Unlike tables that contain data, views simply contain queries that ...