Correlated Subquery: References data from the outer query in its WHERE clause. Nested Subquery: This can be placed anywhere in the outer query and does not directly reference the outer table. Basic SQL Interview Questions 18. What is a function in SQL, and why do we use functions? A func...
Check the documentation for your database system if you run into any issues or need to make adjustments. If you have questions on any query, feel free to ask for help. We’ll guide you through it. Top SQL Queries for Interviews Check out the 50 most-asked SQL query interview questions....
SQL Interview Questions1. What is Pattern Matching in SQL? SQL pattern matching provides for pattern search in data if you have no clue as to what that word should be. This kind of SQL query uses wildcards to match a string pattern, rather than writing the exact word. The LIKE operator...
SQL knowledge is essential for the majority of services. There are a lot of important questions for which the candidates need to be prepared while going for an interview. TheSQL Interview Questionsare very important for getting a job. One must answer the SQL Interview Questions to qualify for ...
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...
SQL INTERVIEW QUESTIONS AND ANSWERS 13 | P a g e 45.What is Self-Join? Self-join is query used to join a table to itself. Aliases should be used for the same table comparison. 46. What is Cross Join? Cross Join will return all records where each row from the first table is combin...
The SQL UPDATE query is used to modify existing records in a database table. It allows changing the values stored in one or more fields of selected records without replacing the entire record. The basic structure includes specifying the table name, field(s) to update, new value(s) to ...
SQL interview questions are asked in almost all interviews because database operations are very common in applications. SQL stands for Structured Query Language, which is a domain-specific programming language used for database communications and relational database management. SQL consists of standard ...
session.query(Customers).from_statement(text("SELECT * FROM customers")).all() The result of above code will be a basic SELECT statement as given below −SELECT * FROM customers Obviously, all records in customers table will be selected.The text() construct allows us to link its textual ...
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 &...