The cells in the right column of the table shown in figure 4.5 have different leading or padding. Observe that the default leading of the content of a cell in text mode is equal to the font size. Internally, the leading is set like this: This is different from the default leading of a Phrase object outside a PdfPCell.
There can be a lot of differences between a UDF and stored procedure, as the prior link has shown. Another difference is the UDF can be directly selected from, whereas a stored procedure requires one to insert the results into a tempory table or table variable.
The SQL CREATE PROCEDURE statement is used to create stored procedures that are stored in the database. The SQL CREATE FUNCTION statement is used to create stored functions that are stored in an Oracle database. A procedure or function is similar to a miniature program.