Как понять логику EXISTS в SQL запросах
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Как следует из названия, данная статья для тех, у кого есть сложности с пониманием SQL запросов, в составе которых, используется EXISTS, т.к., исходя из опыта, его использование частенько вызывает вопросы у начинающих, а иногда даже у продолжающих.
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BY SQL для тестировщика
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SQL для тестировщика from ru