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ne of the primary functions of any database is to be able to manipulate the data stored within its tables. Designated users must be able to insert, update, and delete data as necessary in order to keep the database current and ensure that only the appropriate data is being stored. SQL provides three statements for basic data manipulation: INSERT, UPDATE, and DELETE. In this chapter, I will examine each of these statements and demonstrate how they can be used in an SQL environment to modify data in the database.
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In 7, Try This 7-1, I introduce you briefly to the INSERT statement. As you can see from that exercise, the INSERT statement allows you to add data to the various tables in your database. I present the basic syntax in this section and an alternate syntax in the next section ( Inserting Values from a SELECT Statement ). The syntax for a basic INSERT statement is relatively straightforward: INSERT INTO <table name> [ ( <column name> [ { , <column name> } . . . ] ) ] VALUES ( <value> [ { , <value> } . . . ] ) Only the first and last lines in the syntax are required. The second line is optional. Both the first and second lines are part of the INSERT INTO clause. In this clause, you must identify the name of the table (or view) into which you will be inserting data. The table name follows the INSERT INTO keywords. You then have the option of identifying the column names in the table that will be receiving the data. This is the purpose of the second line in the syntax. You can specify one or more columns, all of which must be enclosed in parentheses. If you specify more than one column, they must be separated using commas.
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Most SQL implementations support inserts into views. However, there are restrictions. For example, you cannot insert into a view if there are table columns that are not included in the view and those columns do not allow null values and do not have a default value defined. Furthermore, if the view has more than one base table, you may not be able to insert into it at all, but if you can, you will be required to name columns from only one of the base tables because an insert can affect only one base table. Always check your vendor documentation.
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8:
Modifying SQL Data
In the third line of syntax, which is the VALUES clause, you must specify one or more values that will be inserted into the table. The list of values must be enclosed in parentheses and, if more than one is specified, they must be separated using commas. In addition, the values must meet the following requirements:
If the column names are not specified in the INSERT INTO clause, then there must be one value for each column in the table and the values must be in the same order as they are defined in the table. If the column names are specified in the INSERT INTO clause, then there must be exactly one value per specified column and those values must be in the same order in which they are defined in the INSERT INTO clause. However, the column names and values do not have to be in the same order as the columns in the table definition. You must provide a value for each column in the table except for columns that either allow null values or have a default value defined. Each value with a character string data type must be enclosed in single quotes. You may use the keyword NULL (or null) as the data value in the VALUES clause to assign a null value to any column that allows nulls.
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