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Maker Data Matrix in Java INTRODUCTION TO SQL, SQL*PLUS, AND SQL DEVELOPER

INTRODUCTION TO SQL, SQL*PLUS, AND SQL DEVELOPER
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If you change settings with the ALTER SESSION command, or if you change certain SQL*Plus settings with the SQL*Plus SET command, you lose these changes as soon as you log off. On startup, SQL* Plus will use the default values again. If you want to avoid the hassle of applying the same changes over and over again, you can store these SQL and SQL*Plus commands in a file with the special name login.sql. This file is automatically executed when you start SQL*Plus, or even when you change connections within a SQL*Plus session with the CONNECT command. Note that SQL*Plus must be able to find this file in the directory it starts in or via the SQLPATH Registry setting. login.sql is an example of a SQL*Plus script. We will revisit this type of file in more detail in 11. If the rows of a result table don t fit on a single line on your screen (and the line wrapping makes the result rather ugly), a solution might be to narrow the display of one or more columns with the SQL*Plus COLUMN command. By default, SQL*Plus displays all columns on the screen with a width derived from the corresponding column definitions found in the data dictionary. Listing 2-21 shows how you can narrow (or widen) the display of alphanumeric columns on your screen by using the FORMAT option of the COLUMN command. Listing 2-21. Changing the Width of Alphanumeric Columns SQL> select * from courses 2 where category = 'BLD'; CODE ---JAV PLS XML DESCRIPTION -----------------------------Java for Oracle developers Introduction to PL/SQL XML for Oracle developers CAT DURATION --- -------BLD 4 BLD 1 BLD 2
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SQL> COLUMN description FORMAT a26 SQL> / CODE ---JAV PLS XML SQL> All SQL*Plus commands (and their optional components) can be abbreviated, as long as the abbreviation is unique. For example, the COLUMN command can be abbreviated to COL, and FORMAT can be abbreviated to FOR (see Listing 2-22). You can influence the width of numeric columns in a similar way, as you can see in Listing 2-22. Listing 2-22. Changing the Display of Numeric Columns SQL> select * from salgrades 2 where grade > 3; DESCRIPTION -------------------------Java for Oracle developers Introduction to PL/SQL XML for Oracle developers CAT DURATION --- -------BLD 4 BLD 1 BLD 2
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INTRODUCTION TO SQL, SQL*PLUS, AND SQL DEVELOPER
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GRADE LOWERLIMIT UPPERLIMIT BONUS ----- ---------- ---------- ----4 2001 3000 200 5 3001 9999 500 SQL> COL bonus FOR 9999.99 SQL> / GRADE LOWERLIMIT UPPERLIMIT BONUS ----- ---------- ---------- -------4 2001 3000 200.00 5 3001 9999 500.00 SQL> If you want to save all your current SQL*Plus settings in a file (a SQL*Plus script file), use the STORE SET command. See Listing 2-23 for the syntax of this command. Listing 2-23. SQL*Plus STORE SET Command Syntax SQL> STORE SET <filename>[.sql] [REPLACE|APPEND] The brackets in Listing 2-23 (around .sql and REPLACE|APPEND) are part of a common syntax notation convention to denote optional command clauses. This convention is also used in Appendix A of this book. In this convention, a vertical bar (|) can be used to separate optional choices, as in [REPLACE|APPEND]. Uppercase components such as SET and APPEND should be entered verbatim; lowercase components (such as <filename>) should be replaced (in this case) by a file name of your own choice. See Appendix A for more details. If you have saved all SQL*Plus settings in a script file by using the STORE SET command, you can restore those settings at any time using the START (or @) command. This allows you to write SQL*Plus scripts that capture all SQL*Plus settings at the beginning, change various settings during script execution, and then restore the original settings at the end of the script.
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