group by, having clause Joins Use the Bypass buffer addition to the select clause in order to explicitly bypass the buffer while selecting the data.
正确的方法不是用视图VIEW, 而是使用SELECT … INTO TABLE … FOR ALL ENTRIES IN 以及 READ TABLE WITH KEY BINARY SEARCH.例如我们要提高读取BSEG表的性能,首先我们会根据GJAHR主键从BKPF表取出部分数据到内表itab,然后使用FOR ALL ENTRIES IN itab WHERE BSEG~BELNR = itab~BELNR ...
7.9 初始化内表 要初始化有或没有表头的内表,使用 REFRESH 语句,用法如下:
但当可以使用表连接查询时尽量不要使用FOR ALL ENTRIES,因为FOR ALL ENTRIES往往会形成多条SQL语句,导致数据库访问次数的增加。 7、 不要使用透明表的嵌套 SELECT FROM TABLE1. SELECT FROM TABLE2. … ENDSELECT. ENDSELECT. 8、 建议少使用INNER JOIN或者OUTER JOIN,因为这些语句不会访问DATA BUFFER,会造成效率...
To prevent repeated copying, another roll buffer is located in between, which is part of the shared memory Paging area: Allocation of memory for the current internal session by transferring pages out of memory, similarly to operating system paging. SAP's memory management concept currently limits ...
Use the Bypass buffer addition to the select clause in order to explicitly bypass the buffer while selecting the data. 9、 使用FOR ALL Entries 不推荐 Loop at int_cntry. Select single * from zfligh into int_fligh where cntry = int_cntry-cntry. Append int_fligh. Endloop. ...
Use the Bypass buffer addition to the select clause in order to explicitly bypass the buffer while selecting the data. 9、 使用FOR ALL Entries 不推荐 Loop at int_cntry. Select single * from zfligh into int_fligh where cntry = int_cntry-cntry. Append int_fligh. Endloop. ...
50.删除内表中数据完全相同的行,只保留一行: delete adjacentduplicates from itab1 COMPARING<f1><f2> / COMPARING ALL FIELDS. 51. spro:后台设定 52. 输出选择框write:/ itab1-flag as checkbox 第四章 ABAP基础 4.1.5 程序运行 1.程序内部调用,如下表: ...
The data objects <fi> or <g i>, or the data objects in the internal table are stored as a data cluster in the cross-program ABAP memory of the current internal session, in a cluster database table <dbtab>, or in the cross-transaction application buffer of the table <dbtab>. EXTRA...
CLIENT, EXPORT TO SHARED BUFFER X X X CLIENT, EXPORT TO SHARED MEMORY X X X CLIENT, IMPORT DIRECTORY X CLIENT, IMPORT FROM DATABASE X X X CLIENT, IMPORT FROM SHARED BUFFER X X X CLIENT, IMPORT FROM SHARED MEMORY X X X CLIENT, INSERT dbtab X CLIENT, MODIFY dbtab X CL...