23 lines
822 B
MySQL
23 lines
822 B
MySQL
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-- WHERE boolean_expression
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-- Comparison operator in `WHERE` clause.
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SELECT * FROM person WHERE id > 200 ORDER BY id;
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-- Comparison and logical operators in `WHERE` clause.
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SELECT * FROM person WHERE id = 200 OR id = 300 ORDER BY id;
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-- IS NULL expression in `WHERE` clause.
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SELECT * FROM person WHERE id > 300 OR age IS NULL ORDER BY id;
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-- Function expression in `WHERE` clause.
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SELECT * FROM person WHERE length(name) > 3 ORDER BY id;
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-- `BETWEEN` expression in `WHERE` clause.
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SELECT * FROM person WHERE id BETWEEN 200 AND 300 ORDER BY id;
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-- Scalar Subquery in `WHERE` clause.
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SELECT * FROM person WHERE age > (SELECT avg(age) FROM person);
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-- Correlated Subquery in `WHERE` clause.
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SELECT * FROM person AS parent WHERE EXISTS (SELECT 1 FROM person AS child WHERE parent.id = child.id AND child.age IS NULL);
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