| What Are Different Types Of
Internal Tables and Their Usage
Standard Internal Tables Standard tables have a linear index. You can access them using either the index or the key. If you use the key, the response time is in linear relationship to the number of table entries. The key of a standard table is always non-unique, and you may not include any specification for the uniqueness in the table definition. This table type is particularly appropriate if you want
to address individual table entries using the index. This is the quickest
way to access table entries. To fill a standard table, append lines using
the (APPEND) statement. You should read, modify and delete lines by referring
to the index (INDEX option with the relevant ABAP command). The response
time for accessing a standard table is in linear relation to the number
of table entries. If you need to use key access, standard tables are appropriate
if you can fill and process the table in separate steps. For example, you
can fill a standard table by appending records and then sort it. If you
then use key access with the binary search option (BINARY), the response
time is in logarithmic relation to
Sorted Internal Tables Sorted tables are always saved correctly sorted by key. They also have a linear key, and, like standard tables, you can access them using either the table index or the key. When you use the key, the response time is in logarithmic relationship to the number of table entries, since the system uses a binary search. The key of a sorted table can be either unique, or non-unique, and you must specify either UNIQUE or NON-UNIQUE in the table definition. Standard tables and sorted tables both belong to the generic group index tables. This table type is particularly suitable if you want the
table to be sorted while you are still adding entries to it. You fill the
table using the (INSERT) statement, according to the sort sequence defined
in the table key. Table entries that do not fit are recognised before they
are inserted. The response time for access using the key is in logarithmic
relation to the number of
Hashed Internal Tables Hashes tables have no internal linear index. You can only access hashed tables by specifying the key. The response time is constant, regardless of the number of table entries, since the search uses a hash algorithm. The key of a hashed table must be unique, and you must specify UNIQUE in the table definition. This table type is particularly suitable if you want mainly
to use key access for table entries. You cannot access hashed tables using
the index. When you use key access, the response time remains constant,
regardless of the number of table entries. As with database tables, the
key of a hashed table is always unique. Hashed tables are therefore a useful
way of constructing and
Index Tables Index table is only used to specify the type of generic parameters in a FORM or FUNCTION. That means that you can't create a table of type INDEX. Internal tables are not DB tables. Standard and Sorted tables in combined are basically called as Index tables and there nothing else. Here is the hierarchy
ANY TABLE
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