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WHERE: Keep Only the Rows You Need

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Lessons in this chapter:

  1. 4.1 Why WHERE Matters (Filter Before You Aggregate)
  2. 4.2 Comparison Operators (=, !=, <, >, <=, >=) with Money Examples
  3. 4.3 How to Filter Text and Numbers (Quotes vs No Quotes)
  4. 4.4 AND, OR and NOT — Combine Conditions Safely
  5. 4.5 IN, BETWEEN and LIKE (% and _) with Real Filters
  6. 4.6 Practice: Filter Coffee Orders by City and Amount

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Ravi Sir's Cards for this chapter

WHERE filters rows. If you include the wrong rows, your totals will be wrong.Revision cardWhat does WHERE do? WHERE filters rows. Only the rows that match the condition are kept for sorting and totals.Interview cardAND vs OR. AND keeps a row only when every condition is true. OR keeps a row when at least one condition is true.Comparison card

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