SQL · Theory

Copy Table

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Copy Table

Copy Table is simple if you keep it on paper. Priya uses it for Priya walking through Copy Table in lab hour.

Keep Copy Table small. Priya should finish Priya walking through Copy Table in a few lines, not a 40-line dump.

Without Copy Table, lab hour gets messy and Priya walking through Copy Table is hard to trust.

Use Copy Table when Priya walking through Copy Table must stay clear. If a simpler SQL step works, use that instead.

Copy Table miss — only reciting the name of Copy Table. Fix it before you talk about advanced SQL.

Copy Table is not a lonely heading. Priya ties it to Priya walking through Copy Table.

One breath for Copy Table, then Priya walking through Copy Table, then only reciting the name of Copy Table. Sit down.

Exam tip

For Copy Table: definition + lab hour + one failure.

Copy Table — sample query

-- Copy Table
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;

Copy Table: create two demo rows, then SELECT qty >= 2 ordered. Say which labels come back.

Short notes

DefCopy Table — Priya uses it for Priya walking through Copy Table in lab hour.
RuleCopy Table → one Copy Table step Priya can write from memory.
RememberCopy Table + an index (lab hour).
UseCopy Table in lab hour (Priya walking through Copy Table).
TrapCopy Table — only reciting the name of Copy Table.
ExCopy Table → Priya walking through Copy Table.

-- Copy Table 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;

Copy Table

Copy Table — sample query

Short notes

Questions

Copy Table

Copy Table — sample query

Short notes

Questions