SAP ITAB OVERVIEW documentation, setup help and example usage

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Internal Tables - Overview
Internal tables provide a means of taking variable data from a fixed structure and storing it in working memory in ABAP. An internal table is a data object that contain any rows with any data type whose total is not defined statically. The data type of an internal table is a table type. As well as the row type, the table type also defines the table category and the table key .
Internal tables offer dynamic arrays and removes the task of programm-driven dynamic memory management from the programmer (see Memory Consumption of Deep Data Objects ). A particularly important use for internal tables is for storing and formatting data from a database table within a program. In conjunction with structures , they are also the best way of defining very complicated data structures in an ABAP program.

Internal Tables - Data Type

Internal Tables - Table Kind

Internal Tables - Table Key

Internal Tables - Access

Row-Based Administration Costs of Internal Tables

Internal Tables - Performance Notes

Notes
For information about the maximum size of an internal table, see Maximum Size of Dynamic Data Objects .

For the obsolete header lines of internal tables, see Internal Tables with Header Line .

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