Change field depending on if field value is contained in other table - abap

Question

So my goal is to change a field in a table for those entries that the value is contained in some other table.
So for example.
If the name "John" from table_abc is contained in the table l_t_xyz then change the value to "ABC".
My approach to this:
SELECT * FROM table_xyz INTO TABLE #DATA(l_t_xyz).
Let's say one of the field of table_xyz is NAME.
And i have a second table, also with the field NAME where I want to change one of the fields
LOOP AT table_abc ASSIGNING FIELD-SYMBOL(<abc_line>) WHERE name in table_xyz-name.
<abc_line>-name = 'ABC'
ENDLOOP.
But this gives me an error that table_xyz is a table without a header line, therefore has no component called "NAME".
How do I solve this. Also I can't find any documentation on the keyword IN. Maybe I am using it wrong in this case.

Answer 1

So I have found another solution, which was inspired by Eray answer.
Basing on ranges
SELECT 'I' AS sign,
'EQ' AS option,
name as low
name as high
into table #DATA(range_table)
LOOP AT table_abc[] ASSIGNING FIELD-SYMBOL(<abc_line>) WHERE name in range_table.
<abc_line>-name = 'abc'
ENDLOOP.

Answer 2

You should define a range for name values which stored in table_xyz.
That's quick example:
TYPES lr_name_range_type TYPE RANGE OF name. "you should define appropriate data type
DATA : lr_name_range TYPE lr_name_range_type.
//define macro
DEFINE fill_range.
lr_name_range = VALUE #( BASE lr_name_range( sign = 'I' option = 'EQ' low = &1 ) ).
END-OF-DEFINITION.
//fill range according to table_xyz values
LOOP AT table_xyz ASSIGNING FIELD-SYMBOL(<fs_xyz>).
fill_range <fs_xyz>-name.
ENDLOOP.
//Now you can use IN keyword for your loop
LOOP AT table_abc ASSIGNING FIELD-SYMBOL(<abc_line>) WHERE name in lr_name_range.
<abc_line>-name = 'ABC'
ENDLOOP.

Answer 3

It's faster:
data lt_name type hashed table of table_xyz-name with unique default key.
SELECT * FROM table_xyz INTO TABLE #DATA(l_t_xyz).
lt_name = value #( for group fgv_name of <fs_xyz> in l_t_xyz
group by <fs_xyz>-name
( fgv_name )
).
LOOP AT table_abc ASSIGNING FIELD-SYMBOL(<fs_line>).
if line_exists( lt_name[ table_line = <fs_line>-name ] )
<fs_line>-name = 'ABC'.
endif.
ENDLOOP.