SQL · Theory

AND

Theory

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AND

AND means both conditions true. WHERE marks >= 40 AND city = 'Pune'; Pune students who passed. If one side is false, the row is out.

Chain — a AND b AND c. Mix with OR only with brackets.

Trap: WHERE marks > 40 AND marks < 40 — empty on purpose. Trap: AND vs comma in English ‘students in Pune and Goa’ — that is OR for city, not AND.

On the example next to this theory — AND — wHERE combines predicates with AND/OR; LIKE does pattern match.

Exam tip

WHERE marks >= 40 AND city = 'Pune';

AND — sample query

CREATE TABLE products (id INTEGER PRIMARY KEY, name TEXT, price REAL);
INSERT INTO products VALUES (1, 'Pen', 10), (2, 'Book', 200), (3, 'Bag', 50);
SELECT * FROM products
WHERE price BETWEEN 20 AND 150 AND name LIKE 'B%';

AND — wHERE combines predicates with AND/OR; LIKE does pattern match.

Short notes

DefAND = both conditions must be true.
RuleBracket when mixing OR.
Trap‘Pune and Goa’ in English is OR in SQL.

CREATE TABLE products (id INTEGER PRIMARY KEY, name TEXT, price REAL); INSERT INTO products VALUES (1, 'Pen', 10), (2, 'Book', 200), (3, 'Bag', 50); SELECT * FROM products WHERE price BETWEEN 20 AND 150 AND name LIKE 'B%';

AND

AND — sample query

Short notes

Questions

AND

AND — sample query

Short notes

Questions