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The VARCHAR2 and CHAR types support two methods of specifying lengths: In bytes: VARCHAR2(10 byte). This will support up to 10 bytes of data, which could be as few as two characters in a multibyte character set. Remember that bytes are not the same as characters in a multi-byte character set! In characters: VARCHAR2(10 char). This will support up to 10 characters of data, which could be as much as 40 bytes of information. Furthermore, VARCHAR2(4000 CHAR) would theoretically support up to 4000 characters of data, but since a character string datatype in Oracle is limited to 4000 bytes, you might not be able to achieve the full 4000 characters. See below for an example.

Using the Excel Table feature makes it easier to maintain the source data for a pivot table In an Excel Table, if you add rows or columns, the new data is automatically included when you update the pivot table If you base a pivot table on unformatted source data, new rows or columns may not be detected, and you would have to manually adjust the source data range each time new data is added, or create a dynamic range in the Name Manager Or, you might forget to adjust the source data range to include the new data, and the pivot table could then show inaccurate results If you add columns to an Excel Table, column headings, such as Column1, are automatically added for you.

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When using a multibyte character set such as UTF8, you would be well advised to use the CHAR modifier in the VARCHAR2/CHAR definition that is, use VARCHAR2(80 CHAR), not VARCHAR2(80), since your intention is likely to define a column that can in fact store 80 characters of data You may also use the session or system parameter NLS_LENGTH_SEMANTICS to change the default behavior from BYTE to CHAR I do not recommend changing this setting at the system level; rather, use it as part of an ALTER SESSION setting in your database schema installation scripts Any application that requires a database to have a specific set of NLS settings makes for an unfriendly application Such applications generally cannot be installed into a database with other applications that do not desire these settings, but rely on the defaults to be in place.

User-defined functions are implemented using Database::create_function(), which has the following form: create_function( name, args, text_rep=Constants::TextRep::ANY ) {|func, *args| ...} Here, name is the name of the SQL function, args is the number of arguments (-1 is variable), and text_rep corresponds to the UTF encoding. Values are UTF8, UTF16LE, UTF16BE, UTF16, and ANY. Finally, the function implementation is defined in the block. Listing 8-15 illustrates a Ruby implementation of hello_newman(). Listing 8-15. hello_newman() in Ruby require 'sqlite3' db = SQLite3::Database.new(':memory:') db.create_function('hello_newman', -1 ) do |func, *args| if args.length == 0 func.result = 'Hello Jerry' else func.result = 'Hello %s' % [args.join(', ')] end end puts puts puts puts db.get_first_value("SELECT db.get_first_value("SELECT db.get_first_value("SELECT db.get_first_value("SELECT hello_newman()") hello_newman('Elaine')") hello_newman('Elaine', 'Jerry')") hello_newman('Elaine', 'Jerry', 'George')")

One other important thing to remember is that the upper bound of the number of bytes stored in a VARCHAR2 is 4,000 However, even if you specify VARCHAR2(4000 CHAR), you may not be able to fit 4,000 characters into that field In fact, you may be able to fit as few as 1,000 characters in that field if all of the characters take 4 bytes to be represented in your chosen character set! The following small example demonstrates the differences between BYTE and CHAR and how the upper bounds come into play We ll create a table with three columns, the first two of which will be 1 byte and one character, respectively, with the last column being 4,000 characters.

Notice that we re performing this test on a multibyte character set database using the character set AL32UTF8, which supports the latest version of the Unicode standard and encodes characters in a variable length fashion using from 1 to 4 bytes for each character: ops$tkyte@ORA11UTF> select * 2 from nls_database_parameters 3 where parameter = 'NLS_CHARACTERSET'; PARAMETER VALUE ------------------------------ -------------------NLS_CHARACTERSET AL32UTF8 ops$tkyte@ORA11UTF> create table t 2 ( a varchar2(1), 3 b varchar2(1 char), 4 c varchar2(4000 char) 5 ) 6 / Table created Now, if we try to insert into our table a single character that is 2 bytes long in UTF, we observe the following:.

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