Question 1:Consecutive Numbers Source: Leetcode Write a SQL query to find all numbers that appear at least three times consecutively. For example, given the above Logs table, 1 is the only number that appears c
Each question comes with a perfectly written answer inline, saving your interview preparation time. It also covers practice problems to help you understand the basic concepts of SQL. We've divided this article into the following sections: SQL Interview Questions PostgreSQL Interview Questions In the ...
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.
When we execute a query and use theWHEREkeyword on a column that does not have an index, then the SQL Server has to do a full-table scan and check every row to find matches. This is a bad practice because it can be unpredictable in terms of execution time. Therefore this process may...
Feel free to ask any kind of SQL-related question to help you during your exercises, learning, and training. You currently need to be logged in to use AI features. AI SQL Generator SQL Fiddle is now enhanced by an AI SQL query generator. You can now generate SQL queries for inserting ...
Let us make a statement before we answer this question:- ‘The more the size of the index key, performance will also degrade accordingly’. Let’s do a small practical example to understand the impact of the same. Below is a simple customer table with customer code and customer name field...
Filter() Text() Query() Text_all()Answer: B) Text()Explanation:In the Text() method, the text is composed into a statement that is passed to the database with the majority of its original form.Discuss this Question 43. How many relationship patterns does SQLAlchemy provide?
44. With respect to the query and the table structure given below,answer the question.SQL> DESC employees Name Null? Type --- --- --- EMPLOYEE_ID NOT NULL NUMBER(6) FIRST_NAME VARCHAR2(20) LAST_NAME NOT NULL VARCHAR2(25) EMAIL NOT NULL VARCHAR2(25) PHONE_NUMBER VARCHAR2(20) ...
Question 6: What about included columns? How can they help? You saw that a query using a nonclustered index had to lookup other columns with a key lookup into the clustered index. What if you frequently queried just a subset of the other columns? What if you were often looking up the ...
Answer to Question 2 To obtain this answer I used the same query, but this time I ordered the scores in Ascending order. SELECT TOP(25) PERCENT WITH TIES StudentName, Score FROM @TestScore ORDER BY Score ASC This means the lowest scores are listed first and will be included in my TOP(...