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SQL?",[6],{"id":123,"slug":124,"question":125,"difficulty":17,"tags":126,"topicId":4,"topicSlug":6,"topicName":5,"topicEmoji":8,"status":19,"starred":20},860,"kakie-otlichiya-mezhdu-ogranicheniyami-primary-i-unique","Какие отличия между ограничениями PRIMARY и UNIQUE?",[6],{"id":128,"slug":129,"question":130,"difficulty":17,"tags":131,"topicId":4,"topicSlug":6,"topicName":5,"topicEmoji":8,"status":19,"starred":20},861,"mozhet-li-znachenie-v-stolbtse-s-ogranicheniem-foreign-key-ravnyatsya-null","Может ли значение в столбце с ограничением FOREIGN KEY равняться NULL?",[6],{"id":133,"slug":134,"question":135,"difficulty":17,"tags":136,"topicId":4,"topicSlug":6,"topicName":5,"topicEmoji":8,"status":19,"starred":20},862,"kak-sozdat-indeks","Как создать индекс?",[6],{"id":138,"slug":139,"question":140,"difficulty":17,"tags":141,"topicId":4,"topicSlug":6,"topicName":5,"topicEmoji":8,"status":19,"starred":20},863,"chto-delaet-operator-merge","Что делает оператор 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функции (Window Functions)?",[6],{"id":198,"slug":199,"question":200,"difficulty":60,"tags":201,"topicId":4,"topicSlug":6,"topicName":5,"topicEmoji":8,"status":19,"starred":20},875,"chto-takoe-cte-common-table-expression","Что такое CTE (Common Table Expression)?",[6],{"id":203,"slug":204,"question":205,"difficulty":60,"tags":206,"topicId":4,"topicSlug":6,"topicName":5,"topicEmoji":8,"status":19,"starred":20},876,"kak-analizirovat-proizvoditelnost-zaprosov-chto-takoe-explain-analyze","Как анализировать производительность запросов? Что такое EXPLAIN ANALYZE?",[6],{"id":208,"slug":209,"question":210,"difficulty":60,"tags":211,"topicId":4,"topicSlug":6,"topicName":5,"topicEmoji":8,"status":19,"starred":20},877,"kakie-tipy-indeksov-sushchestvuyut-i-kogda-kakoy-ispolzovat","Какие типы индексов существуют и когда какой использовать?",[6],{"id":213,"slug":214,"question":215,"difficulty":216,"tags":217,"topicId":4,"topicSlug":6,"topicName":5,"topicEmoji":8,"status":19,"starred":20},878,"kak-optimizirovat-sql-zaprosy","Как оптимизировать SQL-запросы?","senior",[6]]