#sql_dba_questions 검색 결과
✅ *Top SQL Interview Questions with Answers: Part-3* 🧠 *21. How do you handle NULLs in queries?* Use `IS NULL`, `IS NOT NULL`, `COALESCE()`, or `IFNULL()` to manage NULLs. Example: ```sql SELECT name FROM users WHERE email IS NULL; ``` *22. What is COALESCE() in SQL?*…
*Top SQL Interview Questions with Answers: Part-2* 🧠 *11. How do you remove duplicate records?* Use `DISTINCT` or `ROW_NUMBER()` with a CTE to delete duplicates. ```sql SELECT DISTINCT * FROM table_name; ``` Or: ```sql WITH Ranked AS ( SELECT *, ROW_NUMBER() OVER…
> SQL Interview Questions Frequently Asked by Google (Beginner → Advanced) 1. BEGINNER (10 Questions): SQL Fundamentals + Analytical Thinking - (Google Phone Screen / Early Data Round) → Difference between WHERE, HAVING, and QUALIFY, when would Google expect each? → Explain…
In 2025, mastering SQL is more crucial than ever. It’s the backbone of data-driven decision-making in AI, analytics, and modern software development. So I got complete SQL notes, that includes 800+ SQL interview Questions. Just: - Like and repost - Comment 'sql' - Follow me…
𝗠𝗮𝘀𝘁𝗲𝗿 𝗦𝗤𝗟 𝗳𝗿𝗼𝗺 𝗦𝗰𝗿𝗮𝘁𝗰𝗵 𝗶𝗻 𝟮𝟬𝟮𝟱! SQL is the foundation of every data-driven career — from 𝗗𝗮𝘁𝗮 𝗔𝗻𝗮𝗹𝘆𝘀𝗶𝘀 to 𝗕𝗮𝗰𝗸𝗲𝗻𝗱 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 and 𝗔𝗜 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗶𝗻𝗴. I’m sharing my Day-wise SQL Notes for FREE📘 What’s inside 👇…
As a Java developer, for database-related questions, cover these most important topics : 1. ACID properties & how they apply in relational databases 2. Transaction isolation levels & concurrency issues (dirty read, phantom read, repeatable read) 3. Joins vs subqueries vs CTEs…
You have a Java application that performs a transaction across two different databases (DB1 and DB2). How would you ensure data consistency and reliability across both databases during the transaction?
You have a Java application that performs a transaction across two different databases (DB1 and DB2). Explain how you would ensure data consistency ?
Day 4 of SQL - Data manipulation language - Sorting data with ORDER BY - Limiting results with LIMIT Data Manipulation Language DML (Data Manipulation Language) in SQL is all about managing the data within a database. It includes commands that allow you to interact with…
To master SQL, you need to have an extremely good understanding of SQL statements: They're mainly divided into 5 categories: DDL, DQL, DML, DCL, TCL Here's the simplest guide to learning DDL:
SQL Operators to know as a DATA ANALYST 1. Arithmetic Operators Operator Description + Add - Subtract * Multiply / Divide 2. Comparison Operators OperatorDescription = Equal to >…
If you work in data, you will have a SQL interview round. It doesn't matter if you're a data scientist or data engineer. SQL is everywhere. Here are some quick tips from beginner to advanced you should know and be able to talk about in a SQL interview. Beginner - Be able to…
Most important SQL Concepts for Data Analysts: Basic Queries: - SELECT: Retrieving data from a table. - FROM: Specifying the table(s) to query. - WHERE: Filtering rows based on conditions. Data Manipulation: - INSERT INTO: Adding new records. - UPDATE: Modifying existing…
To master SQL, you need to have an extremely good understanding of SQL statements: They're mainly divided into 5 categories: DDL, DQL, DML, DCL, TCL Here's the simplest guide to learn DDL:
100+ SQL Interview Questions 1. Database and SQL - bit.ly/3zGK6S7 3. SQL Query - bit.ly/3bGzN8r 4. SQL Server - bit.ly/3A5qIj0 5. MySQL - bit.ly/3bFkhtE 6. PostgreSQL - bit.ly/3BOLLHP 7. Oracle - bit.ly/3zF2WsH
To master SQL, you need to have an extremely good understanding of SQL statements: They're mainly divided into 5 categories: DDL, DQL, DML, DCL, TCL Here's the simplest guide to learn DDL:
SQL is the backbone of your data career 🏋🏻 You will get 2-3 SQL questions when you appear for interviews SQL for Data Engineering (Quick Guide) /🧵/
100+ SQL Interview Questions 1. Database and SQL - bit.ly/3zGK6S7 3. SQL Query - bit.ly/3bGzN8r 4. SQL Server - bit.ly/3A5qIj0 5. MySQL - bit.ly/3bFkhtE 6. PostgreSQL - bit.ly/3BOLLHP 7. More Queries - bit.ly/3P7qhcb
100+ SQL Interview Questions 1. Database- bit.ly/3zGK6S7 2. SQL Queries - bit.ly/3bGzN8r 3. MSSQL - bit.ly/3A5qIj0 5. MySQL - bit.ly/3bFkhtE 6. Postgres - bit.ly/3BOLLHP 7. Oracle - bit.ly/3zF2WsH more bit.ly/3P7qhcb
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