Can we use select statement inside loop in ABAP?

SELECT SINGLE field FROM db_table INTO -field2. WHERE db_table_field = -field1. ENDLOOP. A more performant approach would be to first read db_table into an internal table and then read from the internal table while inside the loop…

Can we write select statement in loop?

You can select from one table and insert into another in plain SQL (no need for anonymous procedures, no need for FOR loop or any other kind of PL/SQL code).

What is the syntax for loop in ABAP?

LOOP AT itab – cond – ABAP Keyword Documentation. USING KEY keyname is used to determine the table key with which the loop is executed. The table rows to be read in a LOOP loop can also be limited using optional conditions. If no conditions are declared, all table rows are read.

How can we improve the performance of select statement in ABAP?

ABAP Performance tips

1. Using all the keys in SELECT statement.
2. Avoid SELECT *
3. Fetching Single Record.
4. Avoid SELECT-ENDSELECT.
5. Using Indexes.
6. Avoid “INTO CORRESPONDING”
7. SELECT statement inside LOOP.
8. Nested SELECT statement.

What is difference between Select single and select upto 1 row?

Select Single * will pickup only one matching record from the database into the buffer, and returns the same to the internal table. Select upto 1 rows will pickup all the records matching the condition into the buffer, but return the top record to the internal table.

What is select Endselect in ABAP?

select endselect is used when there are multiple records are to be processed and then kept internal table. Use internal table without header line and move correponding records in it.

Which is better cursor or while loop in SQL Server?

While SQL While loop is quicker than a cursor, reason found that cursor is defined by DECLARE CURSOR. Every emphasis of the loop will be executed inside system memory and consuming required server assets.

Do commands ABAP?

The statements DO and ENDDO define a control structure, which can contain a closed statement block statement_block. Without the addition n TIMES, the statement block is repeated until it is exited using one for the statements for leaving loops. In particular, the statement EXIT is ideal for exiting a loop completely.

How do I write an internal query for a selection table?

Following conditions are applied to the new syntax in an Internal table.

1. The select statement must be prefixed with the @ character.
2. Only one internal table as a source can be specified in the select statement.
3. There must have an alias using AS Statement.
4. It should not have deep structures or contains type string.

What is SQL trace in SAP ABAP?

The SQL Trace, which is part of the Performance Trace (transaction ST05), is the most important tool to test the performance of the database. Unfortunately, information on how to use the SQL Trace and especially how to interpret its results is not part of the standard ABAP courses.