SQL · Theory

Add/Delete Column

Theory

23/439

Add/Delete Column

Amit only reaches for Add/Delete Column when a Add/Delete Column dry-run has to stay correct in a small live site.

Add/Delete Column on the board: one Add/Delete Column step Amit can write from memory. Then say what a Add/Delete Column dry-run looks like after.

Skip Add/Delete Column and copy-pasting Add/Delete Column without a dry-run shows up in a small live site.

Add/Delete Column shows up in a small live site. Name a Add/Delete Column dry-run, not “a real-world scenario”.

Don’t do this with Add/Delete Column: copy-pasting Add/Delete Column without a dry-run. Interviewers spot it in ten seconds.

After Add/Delete Column, Amit should still remember copy-pasting Add/Delete Column without a dry-run.

Viva for Add/Delete Column: what it is → one Add/Delete Column step Amit can write from memory → the mistake (copy-pasting Add/Delete Column without a dry-run).

Exam tip

Board: a Add/Delete Column dry-run. Dry-run Add/Delete Column. Name the trap: copy-pasting Add/Delete Column without a dry-run.

Add/Delete Column — sample query

CREATE TABLE items (id INTEGER PRIMARY KEY, title TEXT);
ALTER TABLE items ADD COLUMN price REAL DEFAULT 0;
INSERT INTO items (id, title, price) VALUES (1, 'Pen', 10);
SELECT * FROM items;

Add/Delete Column — aLTER TABLE changes structure without rebuilding the whole table.

Short notes

DefAdd/Delete Column — Amit uses it for a Add/Delete Column dry-run in a small live site.
RuleAdd/Delete Column → one Add/Delete Column step Amit can write from memory.
RememberAdd/Delete Column + InnoDB (a small live site).
UseAdd/Delete Column in a small live site (a Add/Delete Column dry-run).
TrapAdd/Delete Column — copy-pasting Add/Delete Column without a dry-run.
ExAdd/Delete Column → a Add/Delete Column dry-run.

SQL · Theory

Add/Delete Column

← All stacks

Theory

23/439

Add/Delete Column

Amit only reaches for Add/Delete Column when a Add/Delete Column dry-run has to stay correct in a small live site.

Add/Delete Column on the board: one Add/Delete Column step Amit can write from memory. Then say what a Add/Delete Column dry-run looks like after.

Skip Add/Delete Column and copy-pasting Add/Delete Column without a dry-run shows up in a small live site.

Add/Delete Column shows up in a small live site. Name a Add/Delete Column dry-run, not “a real-world scenario”.

Don’t do this with Add/Delete Column: copy-pasting Add/Delete Column without a dry-run. Interviewers spot it in ten seconds.

After Add/Delete Column, Amit should still remember copy-pasting Add/Delete Column without a dry-run.

Viva for Add/Delete Column: what it is → one Add/Delete Column step Amit can write from memory → the mistake (copy-pasting Add/Delete Column without a dry-run).

Exam tip

Board: a Add/Delete Column dry-run. Dry-run Add/Delete Column. Name the trap: copy-pasting Add/Delete Column without a dry-run.

Add/Delete Column — sample query

CREATE TABLE items (id INTEGER PRIMARY KEY, title TEXT);
ALTER TABLE items ADD COLUMN price REAL DEFAULT 0;
INSERT INTO items (id, title, price) VALUES (1, 'Pen', 10);
SELECT * FROM items;

Add/Delete Column — aLTER TABLE changes structure without rebuilding the whole table.

Short notes

DefAdd/Delete Column — Amit uses it for a Add/Delete Column dry-run in a small live site.
RuleAdd/Delete Column → one Add/Delete Column step Amit can write from memory.
RememberAdd/Delete Column + InnoDB (a small live site).
UseAdd/Delete Column in a small live site (a Add/Delete Column dry-run).
TrapAdd/Delete Column — copy-pasting Add/Delete Column without a dry-run.
ExAdd/Delete Column → a Add/Delete Column dry-run.

Add/Delete Column

Add/Delete Column — sample query

Short notes

Questions

Add/Delete Column

Add/Delete Column — sample query

Short notes

Questions