SELECT DISTINCT 语句会去重,只返回不同的记录。SELECT DISTINCT 语句可以使用 WHERE 子句指定查询条件,也可以使用 GROUP BY 子句和 HAVING 子句进行分组和聚合操作。SELECT DISTINCT 语句的基本语法如下: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 SELECTDISTINCT<fi
The select command is the most fundamental function of writing ABAP programs allowing the retrieval of data from SAP database tables. The most efficient use of the select statement is to retrieve data directly into an internal table, Below is an example of how this would be performed. REPORT ...
start-of-SELECTION . select* into corresponding fields of table it_main from sflight where carrid ='AA'. if it_mainisnotinitial. select* intoCORRESPONDINGFIELDSOFtable it_scarr from scarr for all entries in it_main where carrid= it_main-carrid . select* intoCORRESPONDINGFIELDSOFtable it_...
DATA:EMPTAB2 LIKE STANDARD TABLE OF TMPTAB INITIAL SIZE 20. *该方法定义初始化值为10,并有HEADER LINE的内表 DATA:EMPTAB3 LIKE EMPTAB OCCURS10. *定义一个排序表,以NAME为关键字,该内表中NAME字段数据不能重复 DATA:EMPTAB4 LIKE SORTED TABLE OF EMPTAB WITH UNIQUE KEY NAME INITIAL SIZE 10 WIT...
FOR ALL ENTRIES IN <internal table>:可选项,表示使用内部表中的值作为条件来检索数据。 <n>:可选项,表示返回的最大行数。 <hint>:可选项,用于优化数据库查询。 SELECT语句变式 在ABAP中,SELECT语句不仅可以检索多行数据,还可以检索单行数据。为了满足这两种不同的检索需求,ABAP提供了两种SELECT语句的...
The user first creates an internal table, selects the relevant data from customer tables and then places the data in the internal table. Other users can access and use this internal table directly to retrieve the desired information, instead of writing database queries to perform each operation ...
ABAP开发基础知识:5) 内表(Internal Table) 简介:内表与结构体基本类似,它同样是程序运行中被临时创建的一个存储空间,它是一个可包含多条记录的数据表。 内表共有3种类型: 1)Standard:标准表 2)Sorted:排序表 3)Hashed:哈希表,一般用的比较少 本篇文件将重点介绍Standart型内表的定义及功能 1.内表的定义...
loop里不能套select;避免使用select distinct,代替先sort,再delete; ① 抽取数据时,避免使用SELECT *, 尽量使用SELECT A B INTO TABLE ITAB这样的语句。 ② 不要使用SELECT...ENDSELECT语句。 ③ 尽量避免在LOOP中访问数据库。可以在之前先把数据取到内表,在LOOP中用READ TABLE WITH KEY ... BINARY SEARCH....
Specifies an internal table itab, whose name must be prefixed with the @ character, as a data source of a query. The SELECT statement handles the internal table of the AS ABAP like a database table on the database. The ABAP types of the columns in the internal table are mapped to ...
SELECT * FROM ZEMPDET INTO TABLE IT_ITAB WHERE ZEMPNO IN S_EMPNO. END-OF-SELECTION. LOOP AT IT_ITAB. WRITE :/10 it_itab-zempno,it_itab-zempname,it_itab-zempsal. ENDLOOP. So briefly explained how to create internal table inSAP ABAP....