Contents
What are the 3 main clauses of a SQL statement?
SQL clauses
- CONSTRAINT clause.
- FOR UPDATE clause.
- FROM clause.
- GROUP BY clause.
- HAVING clause.
- ORDER BY clause.
- The result offset and fetch first clauses.
- USING clause.
What are the different parts of an SQL statement?
SQL has three main components: the Data Manipulation Language (DML), the Data Definition Language (DDL), and the Data Control Language (DCL).
What are different types of statements supported by SQL?
Types of SQL Statements
- Data Definition Language (DDL) Statements.
- Data Manipulation Language (DML) Statements.
- Transaction Control Statements.
- Session Control Statements.
- System Control Statement.
- Embedded SQL Statements.
How to create a scenario based SQL query?
For a bit experienced resources, the tables are self-explanatory that we have a table of books. Each book belongs to particular book category. A student will borrow the book that will be mentioned in the bookBorrow table which will hold borrowed books information. The scripts of database tables along with data are attached.
Which is the first scenario in SQL interview?
The first and basic scenario would be simple records fetching. If we want to restrict result or apply some filtration on data. The arrangement of the result set in ascending and descending way. In most of the cases, we are required to fetch data from multiple tables. I have tried to cover few cases like
How does the case statement work in SQL?
The SQL CASE Statement The CASE statement goes through conditions and returns a value when the first condition is met (like an if-then-else statement). So, once a condition is true, it will stop reading and return the result. If no conditions are true, it returns the value in the ELSE clause.
How are SQL queries used in real time?
The following are 2 most important queries which are used in 90% of Real Time Scenarios in SQL. Query 1: Create the duplicate table with data Query 2: Create the table structure duplicate to another table. There are situations in Real Time Scenarios of SQL where user needs to find out the procedures information.