SQL · Theory

DECIMAL

Theory

301/439

DECIMAL

DECIMAL sits in lab hour. Farhan’s job is DECIMAL on Farhan's board. Write that first.

DECIMAL order — meaning → one DECIMAL step Farhan can write from memory → one limit. Dumping ten features helps nobody.

Skip DECIMAL and copy-pasting DECIMAL without a dry-run shows up in lab hour.

Farhan ships DECIMAL in lab hour. That is the use case worth saying.

Don’t do this with DECIMAL — copy-pasting DECIMAL without a dry-run. Interviewers spot it in ten seconds.

Place DECIMAL next to nearby SQL work — one DECIMAL step Farhan can write from memory is the link.

Close DECIMAL with: “If I skip it, DECIMAL on Farhan's board goes wrong like this: copy-pasting DECIMAL without a dry-run.”

Exam tip

Say DECIMAL in one breath, then one DECIMAL step Farhan can write from memory, then copy-pasting DECIMAL without a dry-run.

DECIMAL — sample query

-- DECIMAL
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;

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

Short notes

DefDECIMAL — Farhan uses it for DECIMAL on Farhan's board in lab hour.
RuleDECIMAL → one DECIMAL step Farhan can write from memory.
RememberDECIMAL + an index (lab hour).
UseDECIMAL in lab hour (DECIMAL on Farhan's board).
TrapDECIMAL — copy-pasting DECIMAL without a dry-run.
ExDECIMAL → DECIMAL on Farhan's board.

-- DECIMAL 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;

DECIMAL

DECIMAL — sample query

Short notes

Questions

DECIMAL

DECIMAL — sample query

Short notes

Questions