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All brands support use of the DEFAULT keyword as a way of explicitly specifying the default value for a column.
Some brands provide additional ways to solve the problem.
In the solution provided, the expression “1 = 0” in the WHERE clause of the query causes no rows to be returned.
Thus the result of the CTAS statement is an empty table based on the columns in the SELECT clause of the query.
Many times, however, it is more efficient to use a set-based approach to create new rows.
As a shortcut, you can omit the column list in an INSERT statement: of the columns in the table, and be mindful of the order of the values in the VALUES list; you must supply values in the same order in which the database displays columns in response to a SELECT * query.
The past few chapters have focused on basic query techniques, all centered around the task of getting data out of a database.
This chapter turns the tables, and focuses on the following three topic areas: For ease in finding them when you need them, recipes in this chapter have been grouped by topic: all the insertion recipes come first, followed by the update recipes, and finally recipes for deleting data. It begins with the simple problem of inserting a single row.
Likewise, updating and deleting start out as simple tasks.
You can update one record, and you can delete one record.