The access time for a standard table increases in a linear relationship with the number of table entries. You should fill a standard table by appending lines (ABAP APPENDstatement), and read, modify and delete entries by specifying the index (INDEX option with the relevant ABAP command). Index access is the quickest possible access. Standard tables uses: This is the most appropriate type if you are going to address the individual table entries using the index. This means that standard tables can always be filled very quickly The key of a standard table is always non-unique. The system can access records either by using the table index or the key.The response time for key access is proportional to the number of entries in the table. Standard tables have an internal linear index. Internal tables can be divided into three types: The table type determines how ABAP will access individual table entries. The user-defined key can contain any columns of the internal table that are no internal table themselves, and do not contain internal tables. Internal tables with a unique key cannot contain duplicate entries. You can specify whether the key should be UNIQUE or NON-UNIQUE. There are two kinds of key for internal tables - the standard key and a user-defined key. Each component of the structure is a column in the internal table. The line type of an internal table can be any data type and it is a structure.
There are 3 types of data types Line type,Key and Table type.
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