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Chapter 31. ��չ SQL

Table of Contents

31.1. ��չ��ʵ�ֵ�

31.2. PostgreSQL ��ϵͳ

31.2.1. ��
31.2.2. ��
31.2.3. ��
31.2.4. α��
31.2.5. ��̬��

31.3. �û��庯��

31.4. ��ѯ��ԣ�SQL��

31.4.1. ��ϵ� SQL ��
31.4.2. ��͵�SQL��
31.4.3. ��Դ�� SQL ��
31.4.4. ��ؼ��ϵ� SQL ��
31.4.5. ��̬�� SQL ��

31.5. ��

31.6. ��ʧ�Է��

31.7. ��Ժ��

31.8. �ڲ��

31.9. C ��Ժ��

31.9.1. ��̬װ��
31.9.2. ��͵� C ��Ժ��
31.9.3. C ��Ժ��İ汾-0 ��÷��
31.9.4. C ��Ժ��İ汾-1��÷��
31.9.5. ��д��
31.9.6. ��Ӷ�̬��ӵĺ��
31.9.7. ��չ��ܹ�
31.9.8. ��͵� C ��Ժ��
31.9.9. �� C ��ﷵ��У��ͣ�
31.9.10. �� C ��Ժ��ﷵ�ؼ��
31.9.11. ��̬��ͷ��

31.10. �û��ۼ�

31.11. �û��

31.12. �û��

31.13. ��Ż��Ϣ

31.13.1. COMMUTATOR
31.13.2. NEGATOR
31.13.3. RESTRICT
31.13.4. JOIN
31.13.5. HASHES
31.13.6. MERGES (SORT1, SORT2, LTCMP, GTCMP)

31.14. ��չ��ӿ�

31.14.1. ��Ͳ��
31.14.2. ��
31.14.3. ��֧�ֹ��
31.14.4. ��
31.14.5. ��

�ڱ��µ�ʣ�ಿ�֣��ǽ��ͨ��漸�ֶ��չ PostgreSQL SQL ��ѯ��ԣ�

�� Section 31.3 �¿�ʼ��
��ͣ�� Section 31.11 �¿�ʼ��
�� Section 31.12 �¿�ʼ��
�ۼ�� Section 31.10 �¿�ʼ��

31.1. ��չ��ʵ�ֵ�

PostgreSQL �ǿ��չ��Ϊ��Ĳ��Ǳ��ģ� ��Ϥ��׼�Ĺ�ϵ��ݿ�ϵͳ��֪��ǰ��ݿ⣬��ֶ� ��Ϣ�洢��һ��Ϊϵͳ��ĵط��Щϵͳ��ЩΪ��ֵ䣩�� Щ��û��ǰ��Ϊ��һ��ֻ�� DBMS ��Լ��ڲ��Ϣ��ڴˣ� PostgreSQL �ͱ�׼�Ĺ�ϵ��ݿ��ϵͳ��һ��ؼ�� PostgreSQL ��ϵͳ��洢�˸��Ϣ�� ǹ��ڱ��/�ֶε��Ϣ��һ��й��ǵ��ͣ� ��ʷ�ʽ�ȵ��Ϣ��Щ��Ա��û��޸ģ�� PostgreSQL ��ڲ��Щ��Ϊ��ģ��ζ�� PostgreSQL ��Ա��û��չ�� ֮�£��ͳ��ݿ�ϵͳֻ��ͨ��޸� Դ��ڲ��Ӳ��װ�� DBMS ��Ӧ��ṩ��ģ��չ��

PostgreSQL ��ͨ��̬װ�صķ��û��д�Ĵ��ż��һ�� Ҳ��˵��û��԰�һ��Ŀ��ļ� ��磬һ��⣩ ��Ϊһ��ͻ��ʵ�֣� ��ʱ PostgreSQL ��Ҫװ��ǣ� �� SQL д�Ĵ��׼��뵽��ȥ��ֿ�� "��"��ʹ PostgreSQL �ر��ʺ��Ӧ�ú��´洢�ṹ�Ŀ��ٶ��ͣ�

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