SQL Practice - July 3,18 One day off for yesterday because of overtime work. Again, two questions for today. 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...
SQL Interview Questions 1. What is Pattern Matching in SQL? 2. How to create empty tables with the same structure as another table? 3. What is a Recursive Stored Procedure? 4. What is a Stored Procedure? 5. What is Collation? What are the different types of Collation Sensitivity? 6....
Examine the table structures as given. Answer the questions 37 and 38 that follow the query given below: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...
The non-clustered index, on the other hand, does not alter the way information is stored. It instead builds another object or element in a table which points out the original rows of the table when searched. There can be only one clustered index in a single table. On the other hand, t...
Q I have a SQL Server 2000 SP3 database schema which is a build of Table A with a foreign key to Table B. Because the data in Table B is sensitive, I keep it encrypted, but that's not secure enough for my needs. I am looking for a best-practice solution to be able to hide ...
Below are some of the most commonly asked SQL query questions and answers for practice. Get a timer to track your progress and start practicing. 1. Write SQL Query to Display FIRST_NAME with Alias WORKER_NAME. An alias is a user-friendly label for a column in the SQL table. Use the ...
From the following table, write a SQL query to identify the unique salespeople ID. Return salesman_id. Sample table: orders ord_no purch_amt ord_date customer_id salesman_id --- --- --- --- --- 70001 150.5 2012-10-05 3005 5002 70009 270.65 2012-09...
The table you’ll query is named TestScore and contains the following fields: StudentID (Primary KEy) StudentName (Varchar) Score Practice the SQL percentile rank puzzle with this practice data. Rather than creating a table, I declared a table variable. You can add this into query window and...
Best Practice: Use of semi-colon to terminate statements; Best practices in writing queries for huge dataset Best way to delete 311 million records from SQL Server 2017 Best way to Delete million records from billion records table Best way to Delete the Data Best way to force materialize a CT...
The most feared part of the data analyst hiring process is the technical screening. Here are 3 SQL interview questions to practice in 2022.