HW7 ‐ Preparing for a SQL Screening Interview - yentingw-gin/BIDD330_Spring2025_Reporting GitHub Wiki
SQL is a core skill for data professionals. If you are interviewing for a data-relative position, make sure you're confident in the following areas:
1. Core Commands: Know SELECT
, WHERE
, GROUP BY
, JOIN
, and ORDER BY
. Practice filtering and aggregating data.
2. Joins: Master different join types and apply them to real-world scenarios.
3. Window Functions: Be familiar with functions such as ROW_NUMBER()
and LAG()
for tasks like ranking and trend analysis.
4. CTEs/Subqueries: Break down complex logic using Common Table Expressions and nested queries.
5. Hands-On Practice: Try coding challenges on LeetCode, or HackerRank to build speed and confidence.