首先定义一个函数:create function array_contains(ar anyarray, x anyelement) returns boolean as $$ select x = any (ar); $$ language sql;然后将@>与其绑定即可:create operator @> ( leftarg = anyarray, rightarg = anyelement, proce
...for(type element: array){ System.out.println(element); } 注意: System.out.println(array); 这样输出的是数组的首地址...如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 举报,一经查实,本站将立刻删除。 3K20 PostgreSQL中的查询简介
array_to_string(genres, ',')converts thegenresarray into a single string, with each element separated by a comma. Then,LIKE '%Suspense%'searches the resulting string for the specified string. If "Suspense" is found anywhere in the string, the row is returned, as you can see below: ...
/* dsa_pointer to the page array */ dsa_pointer ptchunks; /* dsa_pointer to the chunk array */ dsa_area *dsa; /* reference to per-query dsa area */};在这个数据结构中，有几个重点需要关注的字段：1.TBMStatus status字段 TBM_EMPTY代表当前TIDBitmap是空TBM_ONE_PAGE 代表 ...
@>(anyrange,anyelement) | s | 16 contains element <<(anyrange,anyrange) | s | 1 strictly left &<(anyrange,anyrange) | s | 2 not beyond right boundary &&(anyrange,anyrange) | s | 3 intersects &>(anyrange,anyrange) | s | 4 not beyond left boundary ...
dsa_pointer dsapagetableold; /* dsa_pointer to the old element array */ dsa_pointer ptpages; /* dsa_pointer to the page array */ dsa_pointer ptchunks; /* dsa_pointer to the chunk array */ dsa_area *dsa; /* reference to per-query dsa area */ ...
opcintype; amopopr | amoppurpose | amopstrategy ---+---+--- @>(anyrange,anyelement) | s | 16 contains element <<(anyrange,anyrange) | s | 1 strictly left &<(anyrange,anyrange) | s | 2 not beyond right boundary &&(anyrange,anyrange) | s | 3 intersects &>(anyrange,anyra...
开发的语言有数组的概念,对应于postgresql也有相关的数据字段类型,数组是英文array的翻译,可以定义一维,二维甚至更多维度,数学上跟矩阵很类似。在postgres里面可以直接存储使用,某些场景下使用很方便,也很强大。 环境: OS:CentOS 6.2 DB: PostgreSQL 9.2.4
&&(anyarray,anyarray) | 1 intersection @>(anyarray,anyarray) | 2containsarray <@(anyarray,anyarray) | 3 containedinarray =(anyarray,anyarray) | 4 equality (4rows) 我们的演示数据库有带有航班信息的«routes»视图。在其他视图中,该视图包含«days_of_week»列——发生航班时的工作日数组...
dsa_pointer dsapagetable; /* dsa_pointer to the element array */ dsa_pointer dsapagetableold; /* dsa_pointer to the old element array */ dsa_pointer ptpages; /* dsa_pointer to the page array */ dsa_pointer ptchunks; /* dsa_pointer to the chunk array */ ...