SQL · Theory

AFTER DELETE Trigger

Theory

92/439

AFTER DELETE Trigger

AFTER DELETE Trigger sits in a small live site. Arun’s job is Arun walking through AFTER DELETE Trigger. Write that first.

AFTER DELETE Trigger order: meaning → one AFTER DELETE Trigger step Arun can write from memory → one limit. Dumping ten features helps nobody.

Without AFTER DELETE Trigger, a small live site gets messy and Arun walking through AFTER DELETE Trigger is hard to trust.

Arun ships AFTER DELETE Trigger in a small live site. That is the use case worth saying.

If Arun walking through AFTER DELETE Trigger breaks under AFTER DELETE Trigger, check only reciting the name of AFTER DELETE Trigger first.

After AFTER DELETE Trigger, Arun should still remember only reciting the name of AFTER DELETE Trigger.

Close AFTER DELETE Trigger with: “If I skip it, Arun walking through AFTER DELETE Trigger goes wrong like this: only reciting the name of AFTER DELETE Trigger.”

Exam tip

Say AFTER DELETE Trigger in one breath, then one AFTER DELETE Trigger step Arun can write from memory, then only reciting the name of AFTER DELETE Trigger.

AFTER DELETE Trigger — sample query

CREATE TABLE tags (id INTEGER PRIMARY KEY, label TEXT);
INSERT INTO tags VALUES (1, 'old'), (2, 'keep');
DELETE FROM tags WHERE label = 'old';
SELECT * FROM tags;

AFTER DELETE Trigger — dELETE removes matching rows. TRUNCATE clears a whole table faster (MySQL).

Short notes

DefAFTER DELETE Trigger — Arun uses it for Arun walking through AFTER DELETE Trigger in a small live site.
RuleAFTER DELETE Trigger → one AFTER DELETE Trigger step Arun can write from memory.
RememberAFTER DELETE Trigger + InnoDB (a small live site).
UseAFTER DELETE Trigger in a small live site (Arun walking through AFTER DELETE Trigger).
TrapAFTER DELETE Trigger — only reciting the name of AFTER DELETE Trigger.
ExAFTER DELETE Trigger → Arun walking through AFTER DELETE Trigger.

SQL · Theory

AFTER DELETE Trigger

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Theory

92/439

AFTER DELETE Trigger

AFTER DELETE Trigger sits in a small live site. Arun’s job is Arun walking through AFTER DELETE Trigger. Write that first.

AFTER DELETE Trigger order: meaning → one AFTER DELETE Trigger step Arun can write from memory → one limit. Dumping ten features helps nobody.

Without AFTER DELETE Trigger, a small live site gets messy and Arun walking through AFTER DELETE Trigger is hard to trust.

Arun ships AFTER DELETE Trigger in a small live site. That is the use case worth saying.

If Arun walking through AFTER DELETE Trigger breaks under AFTER DELETE Trigger, check only reciting the name of AFTER DELETE Trigger first.

After AFTER DELETE Trigger, Arun should still remember only reciting the name of AFTER DELETE Trigger.

Close AFTER DELETE Trigger with: “If I skip it, Arun walking through AFTER DELETE Trigger goes wrong like this: only reciting the name of AFTER DELETE Trigger.”

Exam tip

Say AFTER DELETE Trigger in one breath, then one AFTER DELETE Trigger step Arun can write from memory, then only reciting the name of AFTER DELETE Trigger.

AFTER DELETE Trigger — sample query

CREATE TABLE tags (id INTEGER PRIMARY KEY, label TEXT);
INSERT INTO tags VALUES (1, 'old'), (2, 'keep');
DELETE FROM tags WHERE label = 'old';
SELECT * FROM tags;

AFTER DELETE Trigger — dELETE removes matching rows. TRUNCATE clears a whole table faster (MySQL).

Short notes

DefAFTER DELETE Trigger — Arun uses it for Arun walking through AFTER DELETE Trigger in a small live site.
RuleAFTER DELETE Trigger → one AFTER DELETE Trigger step Arun can write from memory.
RememberAFTER DELETE Trigger + InnoDB (a small live site).
UseAFTER DELETE Trigger in a small live site (Arun walking through AFTER DELETE Trigger).
TrapAFTER DELETE Trigger — only reciting the name of AFTER DELETE Trigger.
ExAFTER DELETE Trigger → Arun walking through AFTER DELETE Trigger.

AFTER DELETE Trigger

AFTER DELETE Trigger — sample query

Short notes

Questions

AFTER DELETE Trigger

AFTER DELETE Trigger — sample query

Short notes

Questions