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What is a LEFT OUTER JOIN in SQL and when do we use it? | Ashok IT#sqlinterviewquestions #sqltips

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What is a LEFT OUTER JOIN in SQL and when do we use it? | Ashok IT#sqlinterviewquestions #sqltips

💡 SQL Interview Question: 👉 What is a LEFT OUTER JOIN in SQL and when do we use it? This is a very important SQL interview question to test your understanding of data retrieval from related tables. Here’s the clean SQL query 👇 SELECT e.employee_name, d.department_name FROM employees e LEFT OUTER JOIN departments d ON e.department_id ...

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if you have a SQL test coming up for a data analyst interview and you are panicking right, here’s what you need to know LEFT JOIN combines two tables but keeps everything from your main table even when the other table does not have a match. this is on every single SQL test I have ever seen or written COUNT DISTINCT counts unique values. like how many different customers placed an order. not how many total orders. unique. interviewers love asking this because it tells them you actually understand

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7 SQL Joins You Must Know ➡️ Inner Join: Retrieves records with matching values in both tables. ➡️ Left Join: Retrieves all records from the left table and matching records from the right table. ➡️ Left Join with Null Check: Filters only the records where there is no match in the right table (NULL values). ➡️ Right Join: Retrieves all records from the right table and matching records from the left table. ➡️ Right Join with Null Check: Filters only the records where there is no match in the left

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