ROW_NUMBER()OVER([query_partition_clause]order_by_clause) 参数解释 使用OVER子句定义窗口进行计算。详细信息请参见分析函数说明。 返回类型 返回数值类型数据。 示例 现有已创建的表emp_msg。查询emp_msg表中,按deptno字段分组并按列sal降序排序,返回列sal中各值的序号。
ROW_NUMBER()OVER([query_partition_clause]order_by_clause) 参数解释 使用OVER子句定义窗口进行计算。详细信息请参见分析函数说明。 返回类型 返回数值类型数据。 示例 现有已创建的表emp_msg。查询emp_msg表中,按deptno字段分组并按列sal降序排序,返回列sal中各值的序号。
[T_WIN_FUN_ROW_NUMBER()]), filter(nil), rowset=256 win_expr(T_WIN_FUN_ROW_NUMBER()), partition_by([a.id]), order_by([t4.TI_TechDate, DESC]), window_type(RANGE), upper(UNBOUNDED PRECEDING), lower(UNBOUNDED FOLLOWING) 1 - output([a.id], [b.interface_flt_id], [b.flt_dt]...
CS.SECTIONCODE, CS.PRODUCTGRPCODE, CS.HANDLERCODE, (SELECT DISTINCT(NAME) FROM IFEMPLOYEE EE WHERE EE.CODE = CS.HANDLERCODE AND EE.UNIT_CODE = CS.BRANCHCODE)
背景: 今天业务又扔过来一条sql让优化一下。 分析过程: 先看下sql select * from tbcs.subxxxxxxxx z where z.rowid in (select rowid from (select row_number() over(order by t.aaaatime desc) rown, t.*, t.…
ROW_NUMBER、RANK、DENSE_RANK、PERCENT_RANK CUME_DIST FIRST_VALUE、LAST_VALUE NTH_VALUE、NTILE LEAD、LAG 算子WINDOW_FUNCTION 如下面示例,统计各个仓库下的各个区的销量在本仓库内的排名。 EXPLAIN extended_noaddr SELECT d.D_W_ID , d.D_ID , d.D_NAME , d.D_YTD ,ROW_NUMBER () OVER (PARTITIO...
SELECT d.D_W_ID , d.D_ID , d.D_NAME , d.D_YTD ,ROW_NUMBER () OVER (PARTITION BY d.D_W_ID ORDER BY d.D_YTD DESC ) rn FROM BMSQL_DISTRICT d ORDER BY rn ; ; === |ID|OPERATOR |NAME|EST. ROWS|COST | --- |0 |SORT |...
Select * from (Select c1, c2, c3, row_number() over(partition by c1, c2 order by c4) as rn from table) a where a.rn = 1; 子查询里就用到了窗口函数。本着尽量不让业务修改代码的原则,OceanBase肯定是要全面兼容这种高级SQL用法的。
DB2 应用通常把rownumber和FETCH FIRST N ROWS结合使用来进行分页,在 OB(ORACLE) 3.1 版本之前,需要转换为 OB(ORACLE) 的分页方法。 DB2 示例 CREATETABLEt5AS(SELECT*FROMSYSIBM.TABLES )WITHDATA;SELECT*FROM(SELECTrow_number()OVER(ORDERBYORDEROFt5) rn , *FROMt5ORDERBYtable_schema, table_typeFETCHFIRST...
统计分组汇总 select * from ( select OFFICECODE, listagg(LASTNAME,',') within GROUP (ORDER BY EMPLOYEENUMBER) OVER (partition by OFFICECODE) EMP_LIST, row_number() over (partition by OFFICECODE order by EMPLOYEENUMBER) as rn FROM employees)...