Практикум по SQL от DBI. Занятие №4
7 July 2021, from 10:00 to 14:00 Moscow time
Registration has ended 7 July в 17:00
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About the event
Single row функции. "Ltrim()", "Rtrim()", "Substr()", "Instr()", "Upper()", "Lower()", "Initcap()", "Replace()", "Round()", "Trunc()" и т.д
Обработка Null значений. "NVL()", "NVL2()", "Coalesce()"
Функции преобразования формат или типа данных. "To_Number()", "To_Char()", "To_Date()", "Cast()" и т.д
Агрегационные функции. "SUM()","COUNT()","AVG()","MAX()","MIN()","VARIANCE()" и т.д
Группировка строк с использование оператора "Group By"
Ограничение группировки с помощью оператора "Having"
Использование операторов "Having" и "Where" в запросах с группировкой строк. Отличия в работе "Having" и "Where"
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