232 Part I EXAM PREPARATION FIGURE 4.6 Insert
232 Part I EXAM PREPARATION FIGURE 4.6 Insert of data. Alternatively, you can specify just the VALUES keyword, which is a more convenient method. Values is required unless you are doing INSERT, SELECT OR INSERT, or EXECUTE. The same results are produced with the following query: INSERT INTO TestTable Values(34, may , 2802695 , male , . black ) Data inserted must meet the parameters defined by the table structure. This means that NOT NULL columns must have data provided either through input or through the use of column definitions that provide for their own values. A column can obtain its input value through a DEFAULT, IDENTITY, formula, or default object. Data must also meet all rules and constraints that have been defined in the table schema. Data can be inserted into a table from the resultset of a SELECT query. When this is performed it enables a large amount of data to be extracted from a table or view and stored into another table. INSERT INTO SELECT A SELECT statement can be used within the INSERT statement to add values into a table from one or more other tables or views. Using a SELECT subquery is also a mechanism that enables more than one row to be inserted at one time. This type of INSERT statement is often used to insert data into a separate table from some other table or data source. In this manner the data can be copied or just separated off for handling of exceptions or specialty tasks. For example, imagine you would like to copy all your current employees into a customer table. This will enable your employees to make purchases
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