SQL syntax-interview
Scenario 1: Case Sensitivity in SQL
Imagine you are writing your first SQL query and are unsure whether to use uppercase or lowercase for SQL keywords
Interview Question
What does it mean when we say SQL is not case-sensitive? How does it affect query writing?
Answer:
SQL does not care about case. This indicates that writing SELECT, select, or SeLeCt all have the same purpose. Nonetheless, it is customary practice and helps readability to use uppercase for SQL terms.
Scenario 2: Writing Multi-line Queries
Tips: To make your SQL queries easier to read and manage, capitalize your terms..
Scenario 2: Writing Multi-line Queries
To make a lengthy SQL query easier to understand, you are asked to format it across several lines. You question whether this has an impact on how SQL handles the query.
Interview Question
Is it possible to divide SQL statements into numerous lines? Will it result in mistakes?
Answer:
SQL statements can, in fact, span several lines. SQL reads the full statement as long as it concludes with a semicolon, ignoring line breaks.
Scenario 3: Using SQL KeywordsTips: To make complex searches more readable and structured, divide them into lines.
You're new to SQL and want to know how it determines what action to take when a query is run.
Interview Question
What function do SQL keywords serve, and why do they appear at the start of every SQL statement?
Answer:
SQL keywords provide the action that the statement should take, such as modifying (UPDATE), inserting (INSERT), or obtaining data (SELECT).
Tips: Common SQL keywords are the foundation of all SQL commands, therefore commit them to memory.
Scenario 4: Executing Multiple Statements
You have to write a script having several SQL statements in it. Only the first command runs successfully when you run it.
Interview QuestionHow is handling multiple statements in a script handled by SQL? What is required to carry them out correctly?
Answer:
A semicolon should be used to separate each SQL statement. Only the first complete sentence might execute without it; the others might not.
Tips: To prevent execution issues in scripts, use semicolons consistently.