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SQL · Theory

Show Databases

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Theory

10/439

Show Databases

Show Databases is simple if you keep it on paper. Priya uses it for a Show Databases dry-run in lab hour.

Show Databases on the board: one Show Databases step Priya can write from memory. Then say what a Show Databases dry-run looks like after.

Skip Show Databases and copy-pasting Show Databases without a dry-run shows up in lab hour.

Show Databases shows up in lab hour. Name a Show Databases dry-run, not “a real-world scenario”.

Show Databases trap — copy-pasting Show Databases without a dry-run. Priya loses marks for that every viva.

Place Show Databases next to nearby SQL work — one Show Databases step Priya can write from memory is the link.

Viva for Show Databases: what it is → one Show Databases step Priya can write from memory → the mistake (copy-pasting Show Databases without a dry-run).

Exam tip

Board: a Show Databases dry-run. Dry-run Show Databases. Name the trap: copy-pasting Show Databases without a dry-run.

Show Databases — sample query

-- Database admin (MySQL syntax; run on MySQL server)
-- CREATE DATABASE shop;
-- USE shop;
-- SHOW DATABASES;
SELECT 'Use CREATE/USE/SHOW on MySQL server' AS tip;

Show Databases — cREATE DATABASE makes a schema; USE selects it for following statements.

Short notes

  • DefShow Databases — Priya uses it for a Show Databases dry-run in lab hour.
  • RuleShow Databases → one Show Databases step Priya can write from memory.
  • RememberShow Databases + an index (lab hour).
  • UseShow Databases in lab hour (a Show Databases dry-run).
  • TrapShow Databases — copy-pasting Show Databases without a dry-run.
  • ExShow Databases → a Show Databases dry-run.

Questions

1

Priya asks: why does Show Databases exist? Use a Show Databases dry-run.

2

When would Priya actually reach for Show Databases?

3

Which mistake makes a Show Databases dry-run fail?

4

Dry-run one Show Databases step Priya can write from memory and say the result.

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