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CHAPTER 6 DATA MANIPULATION
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ORA-01555: Snapshot too old See Oracle Concepts for more details about transaction isolation levels. This completes your introduction to data manipulation commands and concepts. You learned about the four DML commands of the SQL language: INSERT, UPDATE, DELETE, and MERGE. Then we discussed transaction processing, using the commands COMMIT, SAVEPOINT, and ROLLBACK. Finally, we briefly discussed read consistency and locking, and introduced the SET TRANSACTION command, which you can use to influence the default read consistency behavior of the Oracle DBMS. Before continuing with 7, which returns to the topic of data definition, make sure that all of your case tables are in their unmodified state. You should have rolled back all of the changes you applied in this chapter. Alternatively, you can re-create the tables before proceeding.
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Data Definition, Part II
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hapter 3 introduced just enough data definition (DDL) syntax to enable you to create the seven case tables for this book, using simple CREATE TABLE commands without any constraint specifications. This second DDL chapter goes into more detail about some data definition aspects, although it is still not intended as a complete reference on the topic. (Discussion of the CREATE TABLE command alone covers more than 100 pages in the Oracle Database 10g documentation.) The first two sections revisit the CREATE TABLE command and the datatypes supported by Oracle Database 10g. Section 7.3 introduces the ALTER TABLE command, which allows you to change the structure of an existing table (such as to add columns or change datatypes), and the RENAME command, which allows you to rename a table or view. You will learn how to define and handle constraints in Section 7.4. Section 7.5 covers indexes. The main purpose of indexes is to improve performance (response time) by providing more efficient access paths to table data. Thus, Section 7.6 provides a brief introduction to performance, mainly in the context of checking if the optimizer is using your indexes. The most efficient method to generate sequence numbers (for example, for order numbers) in an Oracle environment is by using sequences, which are introduced in Section 7.7. We continue with synonyms, in Section 7.8. By creating synonyms you can work with abbreviations for table names, hide the schema name prefix of table names, or even hide the remote database where the table resides. Section 7.9 explains the CURRENT_SCHEMA session parameter. Section 7.10 discusses the DROP TABLE command and the recycle bin, a concept introduced in Oracle Database 10g. By default, all dropped tables go to the recycle bin, allowing you to recover from human errors. The next two sections cover some other SQL commands related to data definition: TRUNCATE and COMMENT. The final section contains some review exercises.
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7.1 The CREATE TABLE Command
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3 introduced the CREATE TABLE command and showed a basic command syntax diagram. This section explores the CREATE TABLE command in a little more detail. Figure 7-1 shows a more (but still far from) complete syntax diagram.
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CHAPTER 7 DATA DEFINITION, PART II
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Figure 7-1. CREATE TABLE command syntax diagram Figure 7-1 shows that the CREATE TABLE command supports two component types: column specifications and constraint specifications. You can provide an optional STORAGE clause, with various physical storage specifications for the table you are creating. This is an important means to optimize and spread the physical storage of your data on disk. For more information about the STORAGE clause and handling physical storage, see Oracle SQL Reference. According to the syntax diagram in Figure 7-1, you can also create new tables based on a subquery with the AS clause. The CREATE TABLE ... AS SELECT ... command (also known as CTAS) is comparable to one of the possibilities of the INSERT command shown in Figure 6-1 (in 6), where you insert rows into an existing table using a subquery. The only difference is that with CTAS, you create and populate the table in a single SQL command. In this case, you can omit the column specifications between the parentheses. If you want to use column specifications anyway, you are not allowed to specify datatypes. In CTAS commands, the new table always inherits the datatypes from the results of the subquery. The syntax for column specifications in a CREATE TABLE command is detailed in Figure 7-2.
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Figure 7-2. CREATE TABLE column specification syntax Figure 7-2 shows that you can specify constraints in two ways: As independent (out-of-line) components of the CREATE TABLE command (see Figure 7-1) As inline constraints inside a column specification (see Figure 7-2) We will discuss both types of constraints in Section 7.4. You can use the DEFAULT option to specify a value (or an expression) to be used for INSERT commands that don t contain an explicit value for the corresponding column.
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