Topic:SQL
Answer:
SQL is 80% of a DAs daily work — pulling data, joins, aggregations, optimization. Without fluent SQL you will not pass the first junior DA screening.
SQL is the foundation of Data Analyst work — on average 80% of the day is SQL queries (pulling data, transformations, aggregations, table joins). Without fluent SQL you will not pass the first screening in any Polish firm — it is the first technical filter 100% of the time. What you need at junior level: SELECT, WHERE, JOIN (INNER, LEFT, RIGHT, FULL), GROUP BY, HAVING, ORDER BY, LIMIT, subqueries, window functions (ROW_NUMBER, RANK, LAG/LEAD), CTEs (Common Table Expressions), index optimization basics. Mate academy teaches SQL deeply (11 lessons in the base module + advanced in data modules), focused on PostgreSQL (most popular in PL). After the course you should write complex analytical queries without trouble. SQL is also valuable in other roles (BA, PM, QA) — a lifetime skill (source: Mate academy data 2026).
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