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This chapter introduces the SQL statements that are used to de ne and manage the database objects in a relational database. As already mentioned, the CREATE, ALTER, and DROP statements comprise a category of the SQL language called Data De nition Language (DDL). DDL is presented rst because you have to create the database objects before you can put any data into the database. However, if you would rather learn another category of SQL such as DQL or DML rst, the chapters are written so that you can skip ahead and come back to this chapter at a later time.

Summary

SQL is based on the relational data model that organizes the data in a database as a collection of tables: I Each table has a table name that uniquely identifies it. I Each table has one or more named columns, which are arranged in a specific, left-to-right order. I Each table has zero or more rows, each containing a single data value in each column. The rows are unordered. I All data values in a given column have the same data type, and are drawn from a set of legal values called the domain of the column. Tables are related to one another by the data they contain. The relational data model uses primary keys and foreign keys to represent these relationships among tables: I A primary key is a column or combination of columns in a table whose value(s) uniquely identify each row of the table. A table has only one primary key. I A foreign key is a column or combination of columns in a table whose value(s) are a primary key value for some other table. A table can contain more than one foreign key, linking it to one or more other tables. I A primary key/foreign key combination creates a parent/child relationship between the tables that contain them.

Queries are the heart of the SQL language, and many people use SQL as a database query tool. The next five chapters describe SQL queries in depth. 5 describes the basic SQL language structures that you use to form SQL statements. 6 discusses simple queries that draw data from a single table of data. 7 expands the discussion to multitable queries. Queries that summarize data are described in 8. Finally, 9 explains the SQL subquery capability that is used to handle complex queries.

5

SQL DDL statements have more options than other SQL statements. For this reason, I have adopted the following conventions for presenting DDL statement syntax in this chapter: SQL keywords and reserved words are shown in uppercase type, such as CREATE TABLE. Information you are expected to supply when writing the statement is shown in italics, such as column_name. Optional items are enclosed in square brackets, such as [WITH TIME ZONE]. Choices from a list of possible items are separated by a vertical bar (the logical symbol for or ), such as TABLE | VIEW | INDEX. You will sometimes see a list of optional choices, such as [NULL | NOT NULL]. Group items that are explained or broken down further (usually following a description of a major statement type) are enclosed between a less than symbol and a greater than symbol, such as <column_speci cation>. An item that may be repeated is followed by an ellipse, such as [,<table_ constraint>...]. All other symbols, particularly commas and parentheses, are part of the required SQL syntax and therefore must be included as written.

his chapter begins a detailed description of the features of SQL. It describes the basic structure of a SQL statement and the basic elements of the language, such as keywords, data types, and expressions. The way that SQL handles missing data through NULL values is also described. Although these are basic features of SQL, there are some subtle differences in the way they are implemented by various popular SQL products, and in many cases, the SQL products provide significant extensions to the capabilities specified in the ANSI/ISO SQL standard. These differences and extensions are also described in this chapter.