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1,808 results
Learn SQL the way data engineers use it. We start from zero with a local PostgreSQL server and DuckDB, generate a practice ...
6 views
7h ago
Explore this lesson and practise on AlgoPath: AQA 8525 (2027 onwards): ...
0 views
20h ago
10 query puzzles. In this intermediate-level lesson, "Intermediate Workout: Query Puzzles", you type real queries, see the real ...
14h ago
Put new data into a table. In this advanced-level lesson, "INSERT: Adding Rows", you type real queries, see the real results on ...
1 view
13h ago
How SQL really runs your query. In this beginner-level lesson, "WHERE vs HAVING and Execution Order", you type real queries, ...
16h ago
Data Analyst Course 2026 | SQL, Power BI, Python, Excel & Real-Time Projects Become a Job-Ready Data Analyst in 2026 ...
29 views
8h ago
Turn rows into columns. In this intermediate-level lesson, "Pivot with CASE", you type real queries, see the real results on screen, ...
Cumulative sums that grow row by row. In this advanced-level lesson, "Running Totals", you type real queries, see the real results ...
Read the message, find the cause, fix it. In this advanced-level lesson, "Common Errors and How to Fix Them", you type real ...
2 views
12h ago
Join a table to itself. In this intermediate-level lesson, "Self Join: Employees and Managers", you type real queries, see the real ...
Add logic inside your queries. In this beginner-level lesson, "CASE: If-Then-Else in SQL", you type real queries, see the real ...
3 views
17h ago
Sirf 15 rows dhoondhne ke liye SQL Server lagbhag 5023 pages kyun read karta hai? Learn It Smart ke SQL Server Indexes ...
4h ago
Tame NULL once and for all. In this beginner-level lesson, "COALESCE, NULLIF and NVL", you type real queries, see the real ...
Insert if new, update if it exists. In this advanced-level lesson, "UPSERT and MERGE", you type real queries, see the real results ...
Prove it, then plan what comes next. In this advanced-level lesson, "Final Challenge and Next Steps", you type real queries, see ...
A separate window for each group. In this advanced-level lesson, "PARTITION BY", you type real queries, see the real results on ...
