Apache Derby – GROUP BY Clause The GROUP BY clause is used with SELECT statements. It is used to form subsets in case of identical data. Usually, this clause is followed by ORDER BY clause and placed after the WHERE clause. Syntax Following is the syntax of GROUP BY clause − ij>SELECT column1, column2, . […]
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Apache Derby – Update Data The UPDATE statement is used to update data in a table. Apache Derby provides two types of updates (syntax) namely searched update and positioned update. The searched UPDATE statement updates all the specified columns of a table. Syntax Following is the syntax of the UPDATE query − ij> UPDATE table_name […]
Apache Derby – Derby Indexes An index in a table is nothing but a pointer to its data. These are used to speed up the data retrieval from a table. If we use indexes, the INSERT and UPDATE statements get executed in a slower phase. Whereas SELECT and WHERE get executed with in lesser time. […]