Rigorous trainer selection
Each trainer is validated on three criteria: hands-on field expertise, proven pedagogy and alignment with your industry.
- Triple validation: technical, pedagogical, sectoral.
- Minimum rating 4.8/5 over the last 12 sessions.
Describe your need, get a tailored program and a pre-filled quote in 3 min. A 100% free call with an advisor.
Founded by passionate learning and innovation experts, Learni's mission is to make professional training accessible to everyone, anywhere in the world. Our team operates in major hubs — London, New York, Boston — and internationally, to support talents and organizations in upskilling.
Don't let this gap widen
Without this intermediate SQL training, slow queries hinder dashboards, costing up to 20% more time for analysts—like 40h/month lost per team of 5 people.
Join errors cause erroneous data, impacting business decisions with 10k€ annual losses.
Non-optimized databases saturate servers, generating 15% downtime and team frustrations.
Miss the opportunity: more agile competitors overtake you, salaries stagnate without advanced mastery.
Invest 28h to triple productivity, avoid 50k€ hidden costs/year, and secure data promotions.
Dive into INNER, LEFT, RIGHT, and FULL joins to link multiple tables, complete practical exercises on real databases with MySQL Workbench, build nested subqueries for dynamic filtering, test on real e-commerce cases, produce optimized deliverable reports, gain autonomy for immediate multi-table analyses.
Explore WINDOW functions, RANK, and PARTITION BY for dynamic rankings, apply aggregations with HAVING on massive volumes, code custom pivots using CASE WHEN, practice on real sales datasets with PostgreSQL, generate SQL-ready charts, master CTEs for recursive queries, leave with production-ready scripts.
Create materialized views and composite indexes to accelerate queries, profile with EXPLAIN ANALYZE on slow queries, refactor SQL code to reduce execution time by 70%, simulate server loads through hands-on exercises, optimize on databases with 1M+ rows, produce deliverable optimization plans, transform your databases into fast, reliable machines.
Manage ACID transactions with COMMIT and ROLLBACK, code stored procedures and triggers, integrate error handling with TRY-CATCH, complete a full ETL final project on a real HR case, debug in teams with professional tools, validate performance before/after, leave with an advanced SQL portfolio and certificate, ready to boost your data projects tomorrow.
The Training SQL Intermediate - Optimize Queries and Databases program is delivered onsite or remote (blended-learning, e-learning, virtual classroom, remote presence). At Learni, an industry-certified training organization, every program is built to maximize skills acquisition regardless of the chosen format.
The trainer alternates between demonstrative, interrogative and active methods (through hands-on labs and/or scenarios). This pedagogical approach guarantees concrete learning that's immediately applicable at work.
For the smooth delivery of the Training SQL Intermediate - Optimize Queries and Databases program, the following equipment is required:
For intra-company training on a site outside Learni, the client commits to providing all required teaching materials (computers, internet, etc.) for the smooth delivery of the program in line with the prerequisites in the communicated program.
Assessment of skills acquired during the Training SQL Intermediate - Optimize Queries and Databases program is performed through:
Learni is committed to making its programs accessible. All our programs are accessible to people with disabilities. Our teams are available to adapt the pedagogical methods to your specific needs. Please contact us for any adjustment request.
Learni programs are available inter-company and intra-company, onsite or remote. Enrollments are possible up to 48 business hours before the program starts. Our programs are eligible for corporate funding paths. Contact us to discuss your training project and funding options.
« cool, j'ai appris des trucs »
« j'etais perdu au debut mais Ramy Saharaoui m'a pas laché, il a pris le temps. merci vraiment »
« la formation dev etait intense mais grave bien. merci Anthony Khelil »
« 😊👍 »
« bien 👍 »
« Allan Busi t'es au top, continue comme ça. formation géniale »
« cool, j'ai appris des trucs »
« j'etais perdu au debut mais Ramy Saharaoui m'a pas laché, il a pris le temps. merci vraiment »
« la formation dev etait intense mais grave bien. merci Anthony Khelil »
« 😊👍 »
« bien 👍 »
« Allan Busi t'es au top, continue comme ça. formation géniale »
« cool, j'ai appris des trucs »
« j'etais perdu au debut mais Ramy Saharaoui m'a pas laché, il a pris le temps. merci vraiment »
« la formation dev etait intense mais grave bien. merci Anthony Khelil »
« 😊👍 »
« bien 👍 »
« Allan Busi t'es au top, continue comme ça. formation géniale »
Before, during, after: we frame the brief, introduce the trainer, tailor the content and measure impact. You stay in control from kickoff to wrap-up.
Each trainer is validated on three criteria: hands-on field expertise, proven pedagogy and alignment with your industry.
30-minute video call between you and the selected trainer to validate the fit, adjust content and clear any final doubts.
No recycled slides. The syllabus is reworked from your real cases: tools, constraints, vocabulary, ongoing projects.
Live evaluations, 30/90/180-day check-ins and a consolidation plan. If the impact misses the mark, we rework it.
A simple promise: you don't pay to discover the trainer on day one. Everything is validated upfront, by you.
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Data EngineeringIndustry-certified30 minutes with a learning advisor. No commitment. No sales pitch dressed up as a demo.