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IntroductionIntroduction
ToTo
Internal TablesInternal Tables

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Report - Internal TablesReport - Internal Tables
 Internal tables fulfill the function of arrays.
 Stores data extracted from database tables.
 Internal tables can be nested.
 It consists of Body and Header line.
 Body – Holds the rows of the internal table.
 Header line – Has same structure as row of the body
holding a single row only.
 Work Area :
 To change or output the contents of an internal table, you need a
work area.
 When processing an internal table, the system always fills the work
area with the contents of the current table line.
 You can then process the work area.
 Header line is the default work area for internal tables with header
line

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Report - Internal TablesReport - Internal Tables

Report - Declaring Internal TablesReport - Declaring Internal Tables
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TYPE typ OCCURS n
Defines an internal table without header line.
Example
TYPES: BEGIN OF LINE_TYPE,
NAME(20) TYPE C,
AGE TYPE I,
END OF LINE_TYPE.
DATA: PERSONS TYPE LINE_TYPE OCCURS 20,
PERSONS_WA TYPE LINE_TYPE.
PERSONS-NAME = 'Michael'.
PERSONS-AGE = 25.
APPEND PERSONS_WA TO PERSONS.

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TYPE typ OCCURS n WITH HEADER LINE
Defines an internal table with header line. Such a table consists of any number of
table lines with the type typ and a header line.
Example
TYPES: BEGIN OF LINE_TYPE,
NAME(20) TYPE C,
AGE TYPE I,
END OF LINE_TYPE.
DATA: PERSONS TYPE LINE_TYPE OCCURS 20 WITH HEADER LINE.
PERSONS-NAME = 'Michael'.
PERSONS-AGE = 25.
APPEND PERSONS.

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 Referencing data dictionary object
 With header line
 DATA FLIGHT_TAB LIKE SFLIGHT OCCURS 10 WITH HEADER LINE.
 Without header line
 DATA FLIGHT_TAB LIKE SFLIGHT OCCURS 10.
 DATA FLIGHT_TAB LIKE SFLIGHT.
 Including structures
 You can Include another structure into Internal table.
DATA : BEGIN OF T_TAB1 OCCURS 10,
FIELDS1 LIKE BKPF-BELNR,
FIELDS2 LIKE BSEG-BUZEI,
END OF T_TAB1.
DATA : BEGIN OF T_TAB2 OCCURS 10.
INCLUDE STRUCTURE T_TAB1.
DATA : END OF T_TAB2.
In this example, T_TAB2 will also contain the fields FIELD1 & FIELD2.

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APPEND Statement
APPEND [wa TO | INITIAL LINE TO] itab.
 Appends a new line to the end of the internal table itab. If you specify wa TO,
the new line is taken from the contents of the explicitly specified work area
wa.
 If you use INITIAL LINE TO, a line filled with the correct value for the type is
added. If the specification before itab is omitted, the new line is taken from
the internal table itab.
 After the APPEND, the system field SY-TABIX contains the index of the
newly added table entry.
Report - Filling Internal TablesReport - Filling Internal Tables

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INSERT Statement
INSERT [wa INTO | INITIAL LINE INTO] itab [INDEX idx].
 Inserts a new line into an internal table. If you specify wa INTO , the new line
is taken from the contents of the explicitly specified work area wa.
 When using INITIAL LINE INTO , a line containing the appropriate initial
value for its type is inserted into the table. If you omit the specification
before itab , the new line is taken from the header line of the internal table
itab.
 INDEX idx specifies the table index before which the line is inserted into the
table itab .
Report - Filling Internal TablesReport - Filling Internal Tables

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Assigning internal tablesAssigning internal tables
 Internal tables without header line
 MOVE ITAB1 TO ITAB2.
 ITAB2 = ITAB1
 Internal tables with header line
 MOVE ITAB1[ ] TO ITAB2[ ].
 ITAB2[ ] = ITAB1[ ].

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Extracting data from database tableExtracting data from database table
SELECT c1 c2 … cn|* FROM <dbtable>
INTO TABLE <itab>
WHERE <condition>.
 dbtable – Name of the database table
 c1,c2,…cn – columns in the database table
 itab – Internal table that holds the data
 condition – WHERE clause condition

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LOOP AT Statement
LOOP AT itab.
LOOP AT itab INTO wa.
 Processes an internal table (DATA) in a loop which begins with LOOP and
ends with ENDLOOP. Each of the internal table entries is sent to the output
area in turn.
 When LOOP AT itab. is used, the header line of the internal table itab is used
as output area.
 In the case of LOOP AT itab INTO wa , there is an explicitly specified work
area wa.
 If the internal table is empty, all the statements between LOOP and
ENDLOOP are ignored.
 In each loop pass, SY-TABIX contains the index of the current table entry.
After leaving a LOOP, SY-TABIX has the same value as it had before.
Report - Retrieving Internal TablesReport - Retrieving Internal Tables

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READ Statement
READ TABLE itab INDEX idx [INTO WA].
READ TABLE itab WITH KEY <k1> = <f1>
<k2> = <f2>…
<kn> = <fn> [INTO wa]
[BINARY SEARCH].
 Reads an internal table entry. An entry can be chosen using a key or its index
idx.
 With "READ TABLE itab.", the header line of the internal table itab is used as
the output area; with "READ TABLE itab INTO wa." the explicitly specified
work area wa is used for this purpose.
 For BINARY SEARCH, the internal table itab should be sorted by the keys
k1,k2…kn.
Report - Retrieving Internal TablesReport - Retrieving Internal Tables

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MODIFY Statement
MODIFY itab [FROM wa] [INDEX idx].
 Changes an entry in the internal table itab .
 If you specify FROM wa , the line is replaced by the explicitly specified
work area wa . If the FROM specification is omitted, the line is replaced
by the header line from itab .
 With INDEX idx, you can specify the table index of the line to be
changed. The index specification can be omitted in a LOOP on an
internal table.
 The INDEX specification can also appear before the FROM
specification.
Note
The counting of table entries begins with 1.
Report - Modifying Internal TablesReport - Modifying Internal Tables

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DELETE Statement
DELETE itab.
 The current entry of the internal table itab is deleted in a LOOP loop.
 Return code value is set to 0.
DELETE itab INDEX idx.
 Deletes the idx entry from the internal table itab .
 The return code value is set as follows:
 SY-SUBRC = 0 The entry was deleted.
 SY_SUBRC = 4 The entry does not exist.
Report - Deleting Internal TablesReport - Deleting Internal Tables

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DELETE Statement
DELETE itab FROM idx1 TO idx2.
 Deletes the line area from index idx1 to idx2 from internal table itab. At least
one of the two parameters FROM idx1 or TO idx2 should be specified.
 If parameter FROM is missing, the area from the start of the table to line
idx2 is deleted.
 If parameter TO is missing, the area from line idx1 to the end of the table is
deleted.
 Start index idx1 must be greater than 0. The return code value is set as
follows:
 SY-SUBRC = 0 At least one entry was deleted.
 SY_SUBRC = 4 None of the entries were deleted.
Report - Deleting Internal TablesReport - Deleting Internal Tables

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SORT Statement
SORT itab DESCENDING.
SORT itab ASCENDING.
SORT itab BY f1 f2 ... fi.
 Sorts the entries of the internal table itab in ascending order. The default
key is used as the sort key for internal tables.
 Sorts itab by the sub-fields f1, f2 , ..., fi which form the sort key. These fields
can be any type (even number fields or tables).
 Unless you specify otherwise, the sort is in ascending order. You can also
use additions 1 and 2 before BY if you want all sub-fields to apply.
 To change the sort sequence for each individual field, specify
DESCENDING or ASCENDING after each of the sub-fields f1 , f2 , ..., fi .
Report - Sorting Internal TablesReport - Sorting Internal Tables

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CLEAR/REFRESHCLEAR/REFRESH
 CLEAR ITAB.
 If ITAB is an internal table without a header line, the entire table is
deleted together with all its entries.
 If, however, ITAB is an internal table with a header line, only the
subfields in the table header entry are reset to their initial values.
 To delete the entire internal table together with all its entries, you
can use CLEAR ITAB[ ] or REFRESH ITAB.
 NOTE:
 CLEAR f.
 Clears the field contents

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DESCRIBE Statement
DESCRIBE TABLE itab.
 Returns the attributes of the internal table itab. You must use at least one of
the additions listed below.
Additions :
1. ... LINES lin
Places the number of filled lines of the table t in the field lin.
2. ... OCCURS n
Transfers the size of the OCCURS parameter from the table definition
to the variable n.
Report - Retrieving Internal Table attributesReport - Retrieving Internal Table attributes

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 All these structures begin with AT and end with ENDAT. The sequence
of statements which lies between them is then executed if a control
break occurs.
 AT NEW f. / AT END OF f.
 f is a sub-field of an internal table processed with LOOP.
 The sequence of statements which follow it is executed if the sub-
field f or a sub-field in the current LOOP line defined (on the left)
before f has a different value than in the preceding (AT NEW) or
subsequent (AT END OF) table line.
 AT FIRST. / AT LAST.
 Executes the appropriate sequence of statements once during the
first (AT FIRST) or last (AT LAST) loop pass.
Report - Control Break With Internal TablesReport - Control Break With Internal Tables

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AT FIRST
Statements are executed before any records are processed while
looping at Internal table.
Example :
LOOP AT itab.
AT FIRST.
WRITE : SY-ULINE.
ENDAT.
ENDLOOP.

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AT LAST
Statements are executed after all records are processed while looping
at Internal table.
Example :
LOOP AT itab.
AT LAST.
WRITE : SY-ULINE.
ENDAT.
ENDLOOP.

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AT NEW <Field Name>
Statements are executed at the beginning of a group of records
containing the same value for <Field Name>..
Example :
LOOP AT itab.
AT NEW I_LIFNR.
WRITE : SY-ULINE
ENDAT.
ENDLOOP.

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AT END OF <Field Name>
Statements are executed at the end of a group of records containing
the same value for <Field Name>.
Example :
LOOP AT itab.
AT END OF I_LIFNR.
WRITE : SY-ULINE.
ENDAT.
ENDLOOP.
Note :
AT NEW and AT END OF make sense only for a sorted
table.

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SUM Statement
SUM.
 SUM calculates the control totals of all fields of type I , F and P and places them
in the LOOP output area (header line of the internal table or an explicitly specified
work area).
 You can use the SUM statement both at the end and the beginning of a control
group
 Example:
LOOP AT itab.
AT LAST.
SUM.
WRITE : itab-fld1.
ENDAT.
ENDLOOP.
Prints the sum of values of fld1 in all rows of itab.
Fld1 should be a numeric type field
Report - SummationReport - Summation

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COLLECT Statement
COLLECT [wa INTO] itab.
 COLLECT is used to summate entries in an internal table.
 COLLECT = APPEND, if no entries with the same key exists
 = Adds the numeric values to their corresponding field
values, if an entry with same key exists
 Used to create summarized tables.

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COLLECT Statement Example
Timesheets per employee per day
INT_EMPTMSHT – EMPNO(char), EDATE(date), HOURS(integer)
Total time per employee for the whole period under consideration
INT_TMSHTSUM – EMPNO(char),HOURS(integer)
INT_EMPTMSHT
1000 20040102 5
1000 20040103 7
1001 20040103 8
1001 20040106 3
INT_TMSHTSUM
1000 12
1001 8

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COLLECT Statement Example
LOOP AT INT_EMPTMSHT.
MOVE-CORRESPONDING INT_EMPTMSHT TO INT_TMSHTSUM.
COLLECT INT_TMSHTSUM.
ENDLOOP.
INT_TMSHTSUM
1000 5
INT_TMSHTSUM
1000 12
INT_TMSHTSUM
1000 12
1001 8
INT_TMSHTSUM
1000 12
1001 11
INT_EMPTMSHT
1000 20040102 5
1000 20040103 7
1001 20040103 8
1001 20040106 3

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 call us on 7058198728 / 8856033664

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