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<TITLE>Sams Teach Yourself ABAP/4® in 21 Days -- Week 2 - At a Glance</TITLE>
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<H1 ALIGN="CENTER">Sams Teach Yourself ABAP/4<SUP>®</SUP> in 21 Days</H1>
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<H2>Week 2... At a Glance</H2>
<P>In Week 2, you create fixed and variable data objects using both predefined and
user-defined data types. You learn the rules of ABAP/ 4 syntax, and the statements
for controlling program flow, assignment statements, and conversion rules. You also
define internal tables, fill them using implicit and explicit work areas, perform
control break processing, and optimize <TT>select</TT> statements to directly and
efficiently fill internal tables. Finally, you use the formatting options of the
<TT>write</TT> statement, experience the effects of data type on the output, employ
conversion exits, and detect their presence within domains.
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<LI>In <A HREF="ch08.htm" tppabs="http://pbs.mcp.com/ebooks/0672312174/ch08/ch08.htm">Day 8</A>, "Defining Data in ABAP/4, Part 2,"
you use the <TT>tables</TT> statement to define field strings, understand the <TT>types</TT>
statement, and use it to define your own data types.
<LI><A HREF="../ch09/ch09.htm" tppabs="http://pbs.mcp.com/ebooks/0672312174/ch09/ch09.htm">Day 9</A>, "Assignments, Conversions, and Calculations,"
teaches you to use common system variables and be able to display or find any system
variable, predict and perform data conversions using assignment statements, and code
mathematical expressions.
<LI>In <A HREF="../ch10/ch10.htm" tppabs="http://pbs.mcp.com/ebooks/0672312174/ch10/ch10.htm">Day 10</A>, "Common Control Statements,"
you learn to code the common control statements <TT>if</TT>, <TT>case</TT>, <TT>do</TT>,
and <TT>while</TT>; control program sequence using <TT>exit</TT>, <TT>continue</TT>,
and <TT>check</TT>; and code simple position and length specifications on the <TT>write</TT>
statement.
<LI>In <A HREF="../ch11/ch11.htm" tppabs="http://pbs.mcp.com/ebooks/0672312174/ch11/ch11.htm">Day 11</A>, "Internal Tables," you learn
to define an internal table with or without a header line, fill an internal table
using <TT>append</TT> via a header line or an explicit work area, and sort internal
tables and use the <TT>as text</TT> addition.
<LI>During <A HREF="../ch12/ch12.htm" tppabs="http://pbs.mcp.com/ebooks/0672312174/ch12/ch12.htm">Day 12</A>, "Advanced Internal Tables,
Part 1," you learn to recognize the table body operator and use it to test for
the existence of data in an internal table, and to compare the contents of two internal
tables for equality.
<LI><A HREF="../ch13/ch13.htm" tppabs="http://pbs.mcp.com/ebooks/0672312174/ch13/ch13.htm">Day 13</A>, "Advanced Internal Tables, Part 2,"
teaches you to fill an internal table from a database table using the most efficient
constructs; perform control break processing on internal tables using <TT>at</TT>
and <TT>on change of</TT>.
<LI>During <A HREF="../ch14/ch14.htm" tppabs="http://pbs.mcp.com/ebooks/0672312174/ch14/ch14.htm">Day 14</A>, "The Write Statement,"
you learn to understand the effect of data types on output, use the formatting options
of the <TT>write</TT> statement, use conversion exits, and detect their presence
within domains.
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