SQL · Theory

LTRIM()()

Theory

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LTRIM()()

LTRIM()() (str) is a SQL idea you prove with a LTRIM str dry-run, not with a slogan.

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

Skip LTRIM()() (str) and copy-pasting LTRIM str without a dry-run shows up in a viva board.

Use LTRIM()() (str) when a LTRIM str dry-run must stay clear. If a simpler SQL step works, use that instead.

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

LTRIM()() (str) is not a lonely heading. Farhan ties it to a LTRIM str dry-run.

One breath for LTRIM()() (str), then a LTRIM str dry-run, then copy-pasting LTRIM str without a dry-run. Sit down.

Exam tip

Board: a LTRIM str dry-run. Dry-run LTRIM()() (str). Name the trap: copy-pasting LTRIM str without a dry-run.

LTRIM()() — sample query

-- LTRIM()()
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;

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

Short notes

DefLTRIM()() (str) — Farhan uses it for a LTRIM str dry-run in a viva board.
RuleLTRIM()() (str) → one LTRIM str step Farhan can write from memory.
RememberLTRIM()() (str) + an index (a viva board).
UseLTRIM()() (str) in a viva board (a LTRIM str dry-run).
TrapLTRIM()() (str) — copy-pasting LTRIM str without a dry-run.
ExLTRIM()() (str) → a LTRIM str dry-run.

-- LTRIM()() 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;

LTRIM()()

LTRIM()() — sample query

Short notes

Questions

LTRIM()()

LTRIM()() — sample query

Short notes

Questions