PostgreSQL 8.2.3 婺桺桺懼
劯锔	媆锔		媆誕	嬉誕

䆹7. 昖臵

䕞嘘

7.1. 楗誄

7.2. 臘臘膆嚟

7.2.1. FROM 床埖
7.2.2. WHERE 床埖
7.2.3. GROUP BY 启 HAVING 床埖

7.3. 锬拷彖臘

7.3.1. 锬拷彖臘釹
7.3.2. 庖枕湺了
7.3.3. DISTINCT

7.4. 䂇劽昖臵

7.5. 臯毐废

7.6. LIMIT 启 OFFSET

7.7. VALUES 彖臘

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劯锔	饡釕	嬉誕
役鍴昄扞	婪婔亓	楗誄