NexionPro Services | Data Quality Engineer | chennai

2 weeks ago

Chennai, India NexionPro Services Full time
Data Quality Engineer (Role)Exp: - 3 - 11 Yrs.Job Location: Chennai/PuneWFO—3 days from client locationNotice Period: Immediate to 15 daysWork Timing: Normal Shift (9 am to 6 pm)

Ready to work as DQE.Share the resume with Deepikanexionpro.com/ Python/Java Coding (any programming language) - Must have2. Advanced SQL (Mandatory) - Must have3. Knowledge of BDD (Selenium, Cucumber) - Good to have (Training can be provided)4. Working knowledge of CI/CD is good to have (training can be provided).5. Hands-on Functional Testing Experience - Good to have (Training can be provided)

Advanced SQL topics delve into more complex database operations and query optimization techniques. Here are some key areas to explore:

Window FunctionsRANK, DENSE_RANK, ROW_NUMBER: Assign a rank to each row within a partition.LEAD, LAG: Access rows preceding or following the current row within a partition.PARTITION BY, ORDER BY: Define partitions and the order within each partition.Window frames: Specify the range of rows included in a window function calculation.Common Table Expressions (CTEs)Recursive CTEs: Create recursive queries to process hierarchical data.Multiple CTEs: Use multiple CTEs to break down complex queries into smaller, more manageable parts.SubqueriesCorrelated subqueries: Subqueries that reference columns from the outer query.Scalar subqueries: subqueries that return a single value.EXISTS and NOT EXISTS: Test for the existence or non-existence of rows in a subquery.Analytical FunctionsCUME_DIST: Calculate the cumulative distribution of a value within a group.PERCENT_RANK: Calculate the percentile rank of a value within a group.NTILE: Divide a result set into a specified number of groups.Full-Text SearchFull-text indexes: Create indexes that support full-text search capabilities.Ranking functions: Rank search results based on relevance.Stop words: Exclude common words from search queries.Hierarchical QueriesCONNECT BY PRIOR: Traverse hierarchical relationships in a table.START WITH: Specify the starting point for a hierarchical query.Optimization TechniquesIndexes: Create appropriate indexes to improve query performance.Query tuning: Analyze query execution plans and optimize queries.Materialized views: Pre-calculate and store query results for faster access.

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