相比Oracle，PostgreSQL中分段查詢的區別在以下幾點：
1. 沒有rownum項，而是用ROW_NUMBER() OVER()表示；
2. 子查詢必須加別名，例如“as aa”，否則語法檢查不通過；

另外分段查詢的一個注意事項：rownum只能做“<”運算。如果寫“>”、“>=”、“between”的時候，起始值只能是0或1。
因為rownum僅對查詢結果排序生效，當寫出“>1”時，第一條記錄會被排除，然后第二條記錄會變成第一條記錄，接著第一條記錄又被排除，……，所以查詢會成功，但查詢結果必定為空。務必注意這一點！！！

ORACLE
select column_name_a, rownum from table_name_a where column_name_a like 'condition%'; select column_name_a, no from (select column_name_a, rownum no from table_name_a where column_name_a like 'condition%') where no > 0 and no <=5; select column_name_a, no from (select column_name_a, rownum no from table_name_a where column_name_a like 'condition%') where no > 5 and no <=10; select column_name_a, no from (select column_name_a, rownum no from table_name_a where column_name_a like 'condition%') where no > 10 and no <=15;
PGSQL
select column_name_a, no from (select column_name_a, ROW_NUMBER() OVER() as no from table_name_a where column_name_a like 'condition%') as aa where no >0 and no <=5; select column_name_a, no from (select column_name_a, ROW_NUMBER() OVER() as no from table_name_a where column_name_a like 'condition%') as aa where no >5 and no <=10; select column_name_a, no from (select column_name_a, ROW_NUMBER() OVER() as no from table_name_a where column_name_a like 'condition%') as aa where no >10 and no <=15;

帶排序功能的高效寫法

ORACLE

select column_name_a from (select column_name_a, row_number() over (order by sal) no from table_name_a where column_name_a like 'condition%' order by column_name_a) where no > 0 and no <= 5; select column_name_a from (select column_name_a, row_number() over (order by sal) no from table_name_a where column_name_a like 'condition%' order by column_name_a) where no > 5 and no <= 10; select column_name_a from (select column_name_a, row_number() over (order by sal) no from table_name_a where column_name_a like 'condition%' order by column_name_a) where no > 10 and no <= 15;
PGSQL

select column_name_a from table_name_a where column_name_a like 'condition%' limit 5 offset 0; select column_name_a from table_name_a where column_name_a like 'condition%' limit 5 offset 5; select column_name_a from table_name_a where column_name_a like 'condition%' limit 5 offset 10;

總結

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