SQL · Theory

Find Duplicate Records

Theory

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Find Duplicate Records

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Exam tip

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Find Duplicate Records — sample query

-- Find Duplicate Records
CREATE TABLE demo (
  id INTEGER PRIMARY KEY,
  label TEXT NOT NULL,
  qty INTEGER DEFAULT 0
);
INSERT INTO demo (id, label, qty) VALUES
  (1, 'alpha', 2),
  (2, 'beta', 5);
SELECT label, qty FROM demo WHERE qty >= 2 ORDER BY qty DESC;

Find Duplicate Records: create two demo rows, then SELECT qty >= 2 ordered. Say which labels come back.

Short notes

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-- Find Duplicate Records CREATE TABLE demo ( id INTEGER PRIMARY KEY, label TEXT NOT NULL, qty INTEGER DEFAULT 0 ); INSERT INTO demo (id, label, qty) VALUES (1, 'alpha', 2), (2, 'beta', 5); SELECT label, qty FROM demo WHERE qty >= 2 ORDER BY qty DESC;

Find Duplicate Records

Find Duplicate Records — sample query

Short notes

Questions

Find Duplicate Records

Find Duplicate Records — sample query

Short notes

Questions