Optum Global Solutions Data Analyst Interview Questions, Process, and Tips

Q1. What is sql
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SQL (Structured Query Language) is a standard programming language for managing and manipulating relational databases.
• SQL is used to query, insert, update, and delete data in databases. Example: SELECT * FROM users;

• It allows for data definition and manipulation through commands like CREATE, ALTER, and DROP. Example: CREATE TABLE orders (id INT, amount DECIMAL);

• SQL supports complex queries with JOIN operations to combin...read more
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Q2. Data warehouse in sql
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A data warehouse is a centralized repository for storing and analyzing large volumes of structured and unstructured data.
• Data warehouses integrate data from multiple sources, such as databases, CRM systems, and flat files.

• They support complex queries and data analysis, enabling businesses to make informed decisions.

• Data is organized in a star or snowflake schema, optimizing query performance.

• ETL (Extract, Transform, Lo...read more
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Health are related ques and puzzles also there .

Q1. Sql based ques logical puzzles
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Q2. Where vs having drop delete truncate
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Where, Drop, Delete, Truncate are SQL commands used for manipulating data in a database.
• WHERE is used to filter data based on a condition

• DROP is used to delete an entire table or database

• DELETE is used to remove specific rows from a table

• TRUNCATE is used to remove all rows from a table

• All these commands are used to manipulate data in a database
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It is very easy . Leetcode easy prob can help out

Q1. Sql basic questions - join , index, optimisation
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Q1. Basic non technical With director
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Q1. Advance SQL questions
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Q2. Python questions
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Q1. What are different types of joins?
Ans. 
Different types of joins include inner join, left join, right join, and full outer join.
• Inner join returns only the matching records from both tables.

• Left join returns all records from the left table and the matching records from the right table.

• Right join returns all records from the right table and the matching records from the left table.

• Full outer join returns all records when there is a match in either left or rig
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Q2. Difference between Rank and dense rank?
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Rank assigns unique numbers to each row, while dense rank assigns consecutive numbers to rows with the same values.
• Rank is used to assign a unique number to each row based on the order specified.

• Dense rank is used to assign consecutive numbers to rows with the same values.

• Rank leaves gaps between the numbers if there are ties, while dense rank does not.

• For example, if we have a dataset with scores of students, rank wil...read more
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