CREATE OR REPLACE FUNCTION get_multiple_result_sets() RETURNS SETOF refcursor AS $$ DECLARE cur1 refcursor; cur2 refcursor; BEGIN -- 打开第一个游标并返回 OPEN cur1 FOR SELECT * FROM table1; RETURN NEXT cur1; -- 打开第二个游标并返回 OPEN cur2 FOR SELECT * FROM table2; RETURN NEXT c...
PostgreSQL11创建或替换过程GetMultipleResultSets(INOUT ref1 refcursor，INOUT ref2 refcursor)；使用Npgsq...
a Parallel Append node can have both partial and non-partial child plans. Non-partial children will be scanned by only a single process, since scanning them more than once would produce duplicate results. Plans that involve appending multiple results sets can therefore achieve...
*/ resultSlot = ExecProject(projInfo, &isDone); if (isDone != ExprEndResult) { node->ps.ps_TupFromTlist = (isDone == ExprMultipleResult); return resultSlot; } } else { /* * Here, we aren't projecting, so just return scan tuple. */ return slot; } } else InstrCountFiltered1(n...
PL/pgSQL functions can return cursors to the caller. This is useful to return multiple rows or columns, especially with very large result sets. To do this, the function opens the cursor and returns the cursor name to the caller (or simply opens the cursor using a portal name specified by...
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3.What is the return type of the PostgreSQL UNNEST() function? The UNNEST() function returns a set of anyelement, meaning it returns a set of rows, each containing one element from the input array. 4.Since which PostgreSQL version is the UNNEST() function available?
return 7; when 'AccessExclusiveLock' then return 8; else return 0; end case; end; $$ language plpgsql strict; 修改查询语句,按锁级别排序: with t_wait as (select a.mode,a.locktype,a.database,a.relation,a.page,a.tuple,a.classid,a.objid,a.objsubid, a.pid,a.virtualtransaction,a....
For any SQL command that does not return rows, for example INSERT without a RETURNING clause, you can execute the command within a PL/pgSQL function just by writing the command. To evaluate an expression or SELECT query but discard the result, use: ...
有各种服务器参数会影响 Azure Cosmos DB for PostgreSQL 的行为,无论是来自标准 PostgreSQL 还是特定于 Azure Cosmos DB for PostgreSQL。 可以在 Azure 门户中为群集设置这些参数。 在“设置”类别下,选择“工作器节点参数”或“协调器节点参数” 。 在这些页面中可为所有工作器节点设置参数,或者只是为协调器节点...