topic Select command in Application Development and Automation Discussions

Select command

Former Member — Sun, 13 May 2007 06:19:41 GMT

Is there any other select command to fetch data from single row like SELECT SINGLE. What is the diffrence between these commands?

Re: Select command

Former Member — Sun, 13 May 2007 06:54:56 GMT

SELECT UPTO 1 row.

Go to the help documentation.

The difference you can see in the help documentation of the select.

Warm Regards,

Baburaj

Re: Select command

Former Member — Sun, 13 May 2007 15:25:43 GMT

hi khan,

the query which is used to fetch single row from data base table alternative to SELECT SINGLE is SELECT UPTO 1 ROW....

The SELECT UPTO 1 ROW query also returns single data from database table...

the difference between both query is that SELECT SINGLE should be used when u have only KEY FIELDS in the where clause...

in case of SELECT UPTO 1 ROW....there is no need of having KEY FIELDS in the where clause...

hope this would solve ur problem...reward pts incase usefull

Regards,

Prashant

Re: Select command

Former Member — Sun, 13 May 2007 17:54:40 GMT

If you want to get single record from data base tables ,then use

Select single * from table into wa-area

where key field is manadtory ( if you do not specify the key field then it would be performance issue)

2nd command ;

select * from table into wa_table up to 1 row

where field = condition ) key field is not mandatory.

Note : if you do not have key field ,then use always select * from table into table up to 1 row.

Reward Points if it is useful

Thanks

Seshu

Re: Select command

Former Member — Sun, 13 May 2007 18:46:51 GMT

difference between select single and select up to 1 row

http://www.sap-img.com/abap/difference-between-select-single-and-select-upto-one-rows.htm

Regards,

Santosh

Re: Select command

Former Member — Mon, 14 May 2007 03:50:16 GMT

Hi,

According to SAP Performance course the SELECT UP TO 1 ROWS is faster than SELECT SINGLE because you are not using all the primary key fields.

select single is a construct designed to read database records with primary key. In the absence of the primary key, it might end up doing a sequential search, whereas the select up to 1 rows may assume that there is no primary key supplied and will try to find most suitable index.

The best way to find out is through sql trace or runtime analysis.

Use "select up to 1 rows" only if you are sure that all the records returned will have the same value for the field(s) you are interested in. If not, you will be reading only the first record which matches the criteria, but may be the second or the third record has the value you are looking for.

The System test result showed that the variant Single * takes less time than Up to 1 rows as there is an additional level for COUNT STOP KEY for SELECT ENDSELECT UP TO 1 ROWS.

The 'SELECT SINGLE' statement selects the first row in the database that it finds that fulfils the 'WHERE' clause If this results in multiple records then only the first one will be returned and therefore may not be unique.

Mainly: to read data from

The 'SELECT .... UP TO 1 ROWS' statement is subtly different. The database selects all of the relevant records that are defined by the WHERE clause, applies any aggregate, ordering or grouping functions to them and then returns the first record of the result set.

Mainly: to check if entries exist.

regards

Haritha

Re: Select command

Former Member — Mon, 14 May 2007 07:57:59 GMT

hi khan

Select single * from table where<condition>.=>this stmt is used to select the first row of the table according to the condition specified.

but,

Select upto 1row from table where<condition>.=> this stmt is used to select the first row and it applies aggregation function on it and at last retreives the first row of the table.

REWARD IT PLEASE..!!!

Re: Select command

Former Member — Mon, 21 May 2007 14:27:14 GMT

Select upto 1row from table where<condition>.=> this stmt is used to select the first row and it applies aggregation function on it and at last retreives the first row of the table.

What exactly the aggregation function applies? Any example.

Thanks.