Luyện thi THPT QG 2018
Single row funtions
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Single row funtions
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Functions make the basic query block more powerful and are used to manipulate data values. This is the first of two lessons that explore functions. You will focus on single row character, number, and date functions, as well as those functions that convert data from one type to another, for example, character data to numeric. At the end of this lesson, you should be able to Explain the various types of functions available in SQL. Identify the basic concepts of using functions. Use a variety of character, number, and date functions in SELECT statements. Explain the conversion functions and how they might be used....
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