Explore SQL tutorials, practical examples, and interview preparation guides from SQLPad.
Understand generated IDs with a tested PostgreSQL rollback fixture, MySQL AUTO_INCREMENT syntax, safe inserted-key retrieval, and explicit gap semantics.
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Learn SQL COUNT, SUM, AVG, MIN, and MAX with exact fixtures that distinguish missing values, zero, duplicate values, empty inputs, and grouped results.
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Choose database tools by transactions, analytical scans, documents, serving, and graph traversal, with a practical experiment and operational checks.
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Compare timestamp predicates in a disposable PostgreSQL lab, inspect executed plans, and validate result counts before claiming performance gains.
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Practice filtering, grouping, joins, EXISTS, and windows on one complete PostgreSQL dataset with expected results and clear NULL and key rules.
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Compare PostgreSQL 16 and MySQL 8.4 with a scoped feature matrix, tested SQL fixture, transaction differences, and an operational decision process.
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Practice CTEs, windows, upserts, recursive cycles, safe dynamic SQL, materialized views, and arrays with complete PostgreSQL fixtures.
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A list of websites where you can download real estate market data to perform your own real estate market analysis. Zillow, Redfin, realtors.com ...
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Compare SQL editors by database and task, replace retired Azure Data Studio, and use a practical checklist to evaluate connections, queries, and exports.
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Set up a fresh MySQL 8.4 development server with existing-data checks, explicit instance verification, local access, and security configuration.
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SQLPad founder Leon Wei, recently did an AMA on Reddit r/sql, he answered some great questions in database, data science, latest technology, industry trends, gr
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SQL is crucial for data scientists since 90% of the time is spent on data processing/munging.
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Avoid the process mistakes that drag out a data job search: generic resumes, weak pipelines, poor timing, and unstructured prep.
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Install a fresh PostgreSQL 16 development server on Apple Silicon, verify the actual instance, and preserve existing clusters during setup and upgrades.
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How SQL interviews are run today, what interviewers score, the warehouse skills that matter, and how to practice the right way.
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A resume guide for data professionals: write for fast recruiter scans, ATS filters, and hiring-manager follow-up questions.
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The window function patterns most data interviews test: running metrics, latest-row logic, ranking, and period-over-period analysis.
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