Luyện thi THPT QG 2018selecting rows
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selecting rows
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In order to extract data from the database you need to use the Structured Query Language (SQL) SELECT command. You may need to restrict the columns that are displayed. This lesson explains all of the commands you will use to perform these actions. You will want to create SELECT statements that can be used time and time again. In this lesson you will also see how to save your statements for later use. At the end of this lesson, you should be able to Write a SELECT statement to query the database. Perform arithmetic calculations using SQL arithmetic operators. Handle null values. Specify alternative column headings...
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