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Add Auto Increment to Existing Column

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Add Auto Increment to Existing Column

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Exam tip

For Add Auto Increment to Existing Column (mysql): definition + a viva board + one failure.

Add Auto Increment to Existing Column — sample query

-- Add Auto Increment to Existing Column
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;

Add Auto Increment to Existing Column: create two demo rows, then SELECT qty >= 2 ordered. Say which labels come back.

Short notes

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-- Add Auto Increment to Existing Column 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;

Add Auto Increment to Existing Column

Add Auto Increment to Existing Column — sample query

Short notes

Questions

Add Auto Increment to Existing Column

Add Auto Increment to Existing Column — sample query

Short notes

Questions