SQL Interview Questions Our schema We'll be going through six questions covering topics like query performance, joins, and SQL injection. They'll refer to the same database for cakes, customers, and orders at a bakery. Here's the schema: CREATETABLEcakes(cake_idINTNOTNULLAUTO_INCREMENTPRIMARY...
SQL stands for Structured Query Language , and it is used to communicate with the Database. This is a standard language used to perform tasks such as retrieval, updation, insertion and deletion of data from a database. 7. What is a unique key? A Unique key constraint uniquely identified e...
Write a query to fetch values in table test_a that are and not in test_b without using the NOT keyword. Note, Oracle does not support the above INSERT syntax, so you would need this instead: insert into test_a(id) values (10); insert into test_a(id) values (20); insert into te...
and the outer query is known as the main query in the Database. The implementation of subqueries is always done first, and the outcome of the following is always passed on to the main query.
SQL Job Interview Questions and Answers 1 :: What is SQL (Structured Query Language)? SQL is an English like language consisting of commands to store, retrieve, maintain & regulate access to your database.Read More 2 :: What is the SQL*Plus? SQL*Plus is an application that recognizes &...
Here are some e-commerce SQL interview questions: 1.Product Catalog Query: Write an SQL query to retrieve the names and prices of all products in the product catalog. 2.Order Summary Query: Create an SQL query to calculate the total revenue generated from orders placed in the last month. ...
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 update information in a database. Usually, a query response returns data from different...
These are just basic questions and you can check the data analyst interview questions here. CLICK HERE TO GET INTERVIEW QUESTIONS FOR TCS… Following are some important Interview Questions for SQL : 1.What is SQL?Where SQL is used? Answer: SQL is Structured Query Language, which is a ...
i will try to explain most important PL/SQL Interview Questions that may ask in interview.PL/SQL is the Procedural Language Structured Query Language which will use to add the business logic. In this article I will try to give the brief description about different PL/SQL interview questions. ...
query. Q.Whatiscorrelatedsub-query? ACorrelatedsub_queryisasub_querywhichhasreferencetothemain query. Q. What is an Integrity Constraint ? A Integrity constraint is a rule that restricts values to a column in a table. Q. What is Referential Integrity ?