y :=y+1;endloop;--sql 拼接sql :='select road_number, sum(frequency) from heat_map where date_key >='''||time1||'-01''and date_key <='''||time2||'-20''and vin in ('||rtrim(car_str,',')||')group by road_number;';--execute sql into out;foriinexecutesql loopreturnn...
【有待研究】return query execute 是 return query 的变形，它指定 sql 将被动态执行；returnqueryselectroad_number,sum(frequency)fromheat_mapgroupbyroad_number;--这样可以sql :='select road_number, sum(frequency) from heat_map group by road_number';returnquery sql;--这样不行参考资料：h...
问创建一个函数，使用postgres逐个查询数组中的所有元素EN版权声明：本文内容由互联网用户自发贡献，该文观点仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。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。
[Name],[Price],[CreateTime],[CustomId] FROM [Order] it WHERE (EXISTS ( SELECT * FROM [OrderDetail] WHERE ( [OrderId] = [it].[Id] ) )) –等同于 WHERE in(SELECT OrderId from orderdetail )5、将多表转成一表,实现动态
*/voidmdclose(SMgrRelation reln,ForkNumber forknum){int nopensegs=reln->md_num_open_segs[forknum];/* No work if already closed */if(nopensegs==0)return;/* close segments starting from the end */while(nopensegs>0){MdfdVec*v=&reln->md_seg_fds[forknum][...
PostgreSQL中还提供了访问数组范围的功能,即ARRAY[脚标下界:脚标上界]。 MyTest=# SELECT name,pay_by_quarter[1:3] FROM sal_emp; name | pay_by_quarter ---+--- Bill | {11000,12000,13000} Carol | {21000,22000,23000} (2 rows)4.6.3 修改数组1). 代替全部数组值:...
String countSql = "select count(0) from (" + sql + ") myCount"; System.out.println("总数sql 语句:"+countSql); PreparedStatement countStmt = connection .prepareStatement(countSql); BoundSql countBS = new BoundSql( mappedStatement.getConfiguration(), countSql, ...
{ /* Tell logtape.c we won't be writing anymore */ LogicalTapeSetForgetFreeSpace(state->tapeset); /* Initialize for the final merge pass */ beginmerge(state); state->status = TSS_FINALMERGE; return; } } /* Select an output tape */ selectnewtape(state); /* Merge one run from ...
as newtable ('||rowc||' varchar,'||columnlist||')';stmt=E' select array_to_json(array_agg(row_to_json(t))) from ('||dynsql2||') t ';executestmtintoresult;returnresult;end$$ 测试用表结构和数据 -- toy example to show how it works...
使用postgres包含: select * from Student where course_id @> array[1] CREATE TABLE Student( name VARCHAR, course_id SMALLINT[] ); INSERT INTO Student ( name, cou...