Advanced SQL Queries Essential for Data Science Interviews

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Window Functions for Analytical Tasks

[{"selector":"#anim-ca315575-a8f4-4c01-8411-70016ca0f1c8","keyframes":{"opacity":[0,1]},"delay":390,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-477a7ae6-76db-4a5f-83c3-3ee59af34c8d","keyframes":{"transform":["translate3d(-113.83286%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":390,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-867d6ba4-f978-408c-8189-dbe385527fe5","keyframes":{"opacity":[0,1]},"delay":600,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-e12acd81-25ff-4ba1-a3b8-3f0db52f5513","keyframes":{"transform":["translate3d(-113.52113%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":600,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-f2a3cf93-99c7-47fc-9367-4f803dd5779e","keyframes":{"opacity":[0,1]},"delay":0,"duration":3000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] Apply functions over a set of rows relative to the current row to perform complex calculations like ranking or running totals. Looking for SQL Interview Questions to prepare for? Click here

CTE and Recursive Queries

[{"selector":"#anim-6ce01c96-c3ef-4e76-8902-85e85d78dbcd","keyframes":{"opacity":[0,1]},"delay":390,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-e14c4f88-7f99-4cd1-97ba-6e300b7e67c6","keyframes":{"transform":["translate3d(-113.83286%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":390,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-0008e5f6-2e2d-4a2b-8cab-a8121b5857a5","keyframes":{"opacity":[0,1]},"delay":600,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-5c77bc01-6644-4038-913f-1cffc1e6c06f","keyframes":{"transform":["translate3d(-113.23944%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":600,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-170fd9d5-b4b6-40f1-96f5-bf1c607d932a","keyframes":{"opacity":[0,1]},"delay":0,"duration":3000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] Define temporary result sets using the WITH clause for clearer, more reusable SQL queries, including handling hierarchical data with recursion. Looking for SQL Interview Questions to prepare for? Click here

PIVOT Tables for Data Transformation

[{"selector":"#anim-eb094d87-d5f5-4f87-b0c1-3c908c91da82","keyframes":{"opacity":[0,1]},"delay":390,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-39316086-ec14-4020-874b-ab78fef764e0","keyframes":{"transform":["translate3d(-113.83286%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":390,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-74b52a10-ff27-4c30-9fcb-e3c249da29c0","keyframes":{"opacity":[0,1]},"delay":0,"duration":3000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-bc597b2f-f630-4373-9af0-b9907ecaef83","keyframes":{"opacity":[0,1]},"delay":600,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-e836af9e-617b-428e-8f8c-5e1c0ca2befb","keyframes":{"transform":["translate3d(-113.52113%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":600,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] Transform rows into columns to summarize data, making it easier to read & analyze distinct values from one column across multiple columns. Looking for SQL Interview Questions to prepare for? Click here

Dynamic SQL for Flexible Queries

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Advanced Aggregate Functions

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Pattern Matching

[{"selector":"#anim-f8be1008-ac33-404a-9691-3eb7593dba23","keyframes":{"opacity":[0,1]},"delay":600,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-0b932667-8308-4b88-80ac-fb08a3726b1a","keyframes":{"transform":["translate3d(-113.52113%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":600,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-52dfa728-298d-40af-b2b4-87c7822ef78e","keyframes":{"opacity":[0,1]},"delay":390,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-e2e8f6f0-fcda-471b-b737-f8d136d921b0","keyframes":{"transform":["translate3d(-113.83286%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":390,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-f0375ea4-52f6-475a-b929-25f7e4bab296","keyframes":{"opacity":[0,1]},"delay":0,"duration":3000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] Search for specific patterns within data using LIKE, SIMILAR TO, or regular expressions, essential for data cleaning and text analysis. Looking for SQL Interview Questions to prepare for? Click here

Temporal Data and Time Series Analysis

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This comprehensive guide will help you prepare for all aspects of the interview process. Don't miss out on your next opportunity!

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