SQL · Theory

Change Table Name

Theory

336/439

Change Table Name

RENAME TABLE students TO learners; or ALTER TABLE students RENAME TO learners; Both change the table name. Apps and FOREIGN KEYs that still say students will break until you update them.

Trap — renaming in production during peak hours without updating the app.

On the example next to this theory: Change Table Name: create two demo rows, then SELECT qty >= 2 ordered. Say which labels come back.

Exam tip

RENAME TABLE students TO learners;

Change Table Name — sample query

-- Change Table Name
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;

Change Table Name: create two demo rows, then SELECT qty >= 2 ordered. Say which labels come back.

Short notes

DefRENAME TABLE old TO new;
RuleUpdate app SQL and FKs after a rename.
TrapRename without changing the code.

-- Change Table Name 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;

Change Table Name

Change Table Name — sample query

Short notes

Questions

Change Table Name

Change Table Name — sample query

Short notes

Questions