SQL · Theory

Literals(Constants)

Theory

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Literals(Constants)

Literals(Constants) sits in a campus project. Rohit’s job is Rohit walking through LiteralsConstants. Write that first.

For Literals(Constants), InnoDB is in play. Don’t blame it until you have traced Rohit walking through LiteralsConstants.

Literals(Constants) exists so Rohit can keep Rohit walking through LiteralsConstants correct in a campus project.

Rohit ships Literals(Constants) in a campus project. That is the use case worth saying.

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

After Literals(Constants), Rohit should still remember copy-pasting LiteralsConstants without a dry-run.

One breath for Literals(Constants), then Rohit walking through LiteralsConstants, then copy-pasting LiteralsConstants without a dry-run. Sit down.

Exam tip

Say Literals(Constants) in one breath, then one LiteralsConstants step Rohit can write from memory, then copy-pasting LiteralsConstants without a dry-run.

Literals(Constants) — sample query

-- Literals(Constants)
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;

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

Short notes

DefLiterals(Constants) — Rohit uses it for Rohit walking through LiteralsConstants in a campus project.
RuleLiterals(Constants) → one LiteralsConstants step Rohit can write from memory.
RememberLiterals(Constants) + InnoDB (a campus project).
UseLiterals(Constants) in a campus project (Rohit walking through LiteralsConstants).
TrapLiterals(Constants) — copy-pasting LiteralsConstants without a dry-run.
ExLiterals(Constants) → Rohit walking through LiteralsConstants.

-- Literals(Constants) 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;

Literals(Constants)

Literals(Constants) — sample query

Short notes

Questions

Literals(Constants)

Literals(Constants) — sample query

Short notes

Questions