SQL · Theory

REVERSE()()

Theory

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REVERSE()()

REVERSE()() (str) sits in a small live site. Dev’s job is REVERSE str on Dev's board. Write that first.

Do REVERSE()() (str) once by hand. one REVERSE str step Dev can write from memory. Change one input. Say the new result out loud.

Without REVERSE()() (str), a small live site gets messy and REVERSE str on Dev's board is hard to trust.

REVERSE()() (str) shows up in a small live site. Name REVERSE str on Dev's board, not “a real-world scenario”.

REVERSE()() (str) miss — copy-pasting REVERSE str without a dry-run. Fix it before you talk about advanced SQL.

After REVERSE()() (str), Dev should still remember copy-pasting REVERSE str without a dry-run.

One breath for REVERSE()() (str), then REVERSE str on Dev's board, then copy-pasting REVERSE str without a dry-run. Sit down.

Exam tip

Say REVERSE()() (str) in one breath, then one REVERSE str step Dev can write from memory, then copy-pasting REVERSE str without a dry-run.

REVERSE()() — sample query

-- REVERSE()()
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;

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

Short notes

DefREVERSE()() (str) — Dev uses it for REVERSE str on Dev's board in a small live site.
RuleREVERSE()() (str) → one REVERSE str step Dev can write from memory.
RememberREVERSE()() (str) + an index (a small live site).
UseREVERSE()() (str) in a small live site (REVERSE str on Dev's board).
TrapREVERSE()() (str) — copy-pasting REVERSE str without a dry-run.
ExREVERSE()() (str) → REVERSE str on Dev's board.

-- REVERSE()() 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;

REVERSE()()

REVERSE()() — sample query

Short notes

Questions

REVERSE()()

REVERSE()() — sample query

Short notes

Questions