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. Except: Except operation returns rows from the first query that are not in the second query. INTERSECT: Intersect returns rows that are common to both queries. 14. What is a subquery? A subquery is a query nest...
UNION: Union operation combines results from two queries, and removes duplicates. Except: Except operation returns rows from the first query that are not in the second query. INTERSECT: Intersect returns rows that are common to both queries. 14. What is a subquery? A subquery is a query nest...
UNIONand INTERSECT queries with how much the other versions differ. SELECT S.sid FROM Sailors S, Boats B1, Reserves R1, Boats B2, Reserves R2 WHERE S.sid=R1.sid AND R1.bid=B1.bid AND S.sid=R2.sid AND R2.bid=B2.bid AND(B1.color=‘red’ ANDB2.color=‘green’) SELECT S.sid...
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...
Hibernateis Object Relational Mapping tool in Java. Hibernate let’s us write object-oriented code and internally converts them to native SQL queries to execute against a relational database. Hibernate uses its own language like SQL which is called Hibernate Query Language(HQL). The difference is...
It is generally embedded with a where clause. Below is the syntax of a subquery. The subquery executes before the main query. Q9: Difference between correlated query and subquery in SQL Server. Correlated Queries are one of the types of subqueries where it output of the query is dependent ...
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. ...
The questions and answers are covered using every detail possible and they also contain queries as and where necessary. This ensures that you learn every bit of it and be well-prepared for the interview. To begin with, we will cover the basic concepts about SQL. Further, we will move towar...
Note that this does nothing to the thread per se, and this doesn't work against the XML for Analysis (XMLA) SDK. XMLA will attempt to cancel queries in SQL Server 2005 by sending the cancel request to the server, but this is not guaranteed to be an immediate operation....