Graphviz/dot file to produce the SQL hierarchy image

// vi: foldmethod=marker foldmarker={{{,}}}
digraph SQL_DATATYPES {

   root [ // {{{
     shape = plaintext
     color = "#cccccc"
     label = <
     <table border='0' cellborder='1'>
       <tr><td><font point-size='19'><b>SQL Data Types</b></font></td></tr>
     </table>
   >]; // }}}

   constructed [ // {{{
     shape = plaintext
     color = "#cccccc"
     label = <
     <table border='0' cellborder='1'>
       <tr><td align=left>Constructed data types</td></tr>
       <tr><td align=left>A.k.a composite data types</td></tr>
     </table>
   >]; // }}}

   predefined [ // {{{
     shape = plaintext
     color = "#cccccc"
     label = <
     <table border='0' cellborder='1'>
       <tr><td><b>Predefined</b> data types</td></tr>
     </table>
   >]; // }}}

   numeric [ // {{{
     shape = plaintext
     color = "#cccccc"
     label = <
     <table border='1' cellborder='0'>
       <tr><td align='left'>Numeric</td></tr>
     </table>
   >]; // }}}

   numeric_excact [ // {{{
     shape = plaintext
     color = "#cccccc"
     label = <
     <table border='0' cellborder='1' cellspacing='0'>
       <tr><td align='left' colspan='2'>Exact</td></tr>
       <tr><td align='left'><font point-size='8' face='Courier'>NUMERIC</font></td><td align='left'></td></tr>
       <tr><td align='left'><font point-size='8' face='Courier'>DECIMAL(p,s)</font></td><td align='left'><font point-size='8'><font face='Courier'>p</font> digits, <font face='Courier'>s</font> decimals</font></td></tr>
       <tr><td align='left'><font point-size='8' face='Courier'>SMALLINT</font></td><td align='left'><font point-size='8'>2 byte (signed short)</font></td></tr>
       <tr><td align='left'><font point-size='8' face='Courier'>INT/INTEGER</font></td><td align='left'><font point-size='8'>4 byte (signed int)</font></td></tr>
       <tr><td align='left'><font point-size='8' face='Courier'>BIGINT</font></td><td></td></tr>
     </table>
   >]; // }}}

   numeric_approximate [ // {{{
     shape = plaintext
     color = "#cccccc"
     label = <
     <table border='0' cellborder='1' cellspacing='0'>
       <tr><td align='left'>Approximate</td></tr>
       <tr><td align='left'><font point-size='8' face='Courier'>FLOAT</font></td></tr>
       <tr><td align='left'><font point-size='8' face='Courier'>REAL</font></td></tr>
       <tr><td align='left'><font point-size='8' face='Courier'>DOUBLE PRECISION</font></td></tr>
     </table>
   >]; // }}}

   string [ // {{{
     shape = plaintext
     color = "#cccccc"
     label = <
     <table border='0' cellborder='1'>
       <tr><td>String</td></tr>
     </table>
   >]; // }}}

   string_blob [ // {{{
     shape = plaintext
     color = "#cccccc"
     label = <
     <table border='0' cellborder='1'>
       <tr><td align='left'><font face='Courier'>BLOB</font></td></tr>
     </table>
   >]; // }}}

   character [ // {{{
     shape = plaintext
     color = "#cccccc"
     label = <
     <table border='0' cellborder='1'>
       <tr><td>Character</td></tr>
     </table>
   >]; // }}}

   character_fixed [ // {{{
     shape = plaintext
     color = "#cccccc"
     label = <
     <table border='0' cellborder='1' cellspacing='0'>
       <tr><td align='left'>Fixed</td></tr>
       <tr><td align='left'><font face='Courier' point-size='8'>CHAR(n)</font></td></tr>
     </table>
   >]; // }}}

   character_varying [ // {{{
     shape = plaintext
     color = "#cccccc"
     label = <
     <table border='0' cellborder='1' cellspacing='0'>
       <tr><td align='left'>varying</td></tr>
       <tr><td align='left'><font face='Courier' point-size='8'>VARCHAR(n)</font></td></tr>
       <tr><td align='left'><font face='Courier' point-size='8'>TEXT</font></td></tr>
     </table>
   >]; // }}}

   clob [ // {{{
     shape = plaintext
     color = "#cccccc"
     label = <
     <table border='0' cellborder='1'>
       <tr><td><font face='Courier'>CLOB</font></td></tr>
     </table>
   >]; // }}}

   datetime [ // {{{
     shape = plaintext
     color = "#cccccc"
     label = <
     <table border='0' cellborder='1'>
       <tr><td>Datetime</td></tr>
     </table>
   >]; // }}}

   date [ // {{{
     shape = plaintext
     color = "#cccccc"
     label = <
     <table border='0' cellborder='1'>
       <tr><td>Date</td></tr>
     </table>
   >]; // }}}

   time [ // {{{
     shape = plaintext
     color = "#cccccc"
     label = <
     <table border='0' cellborder='1'>
       <tr><td>Time</td></tr>
     </table>
   >]; // }}}

   timestamp [ // {{{
     shape = plaintext
     color = "#cccccc"
     label = <
     <table border='0' cellborder='1'>
       <tr><td>Timestamp</td></tr>
     </table>
   >]; // }}}

   boolean [ // {{{
     shape = plaintext
     color = "#cccccc"
     label = <
     <table border='0' cellborder='1'>
       <tr><td>Boolean</td></tr>
     </table>
   >]; // }}}

   interval [ // {{{
     shape = plaintext
     color = "#cccccc"
     label = <
     <table border='0' cellborder='1'>
       <tr><td>Interval</td></tr>
     </table>
   >]; // }}}

   udt [ // {{{
     shape = plaintext
     color = "#cccccc"
     label = <
     <table border='0' cellborder='1'>
       <tr><td>User-defined types (UDT)</td></tr>
     </table>
   >]; // }}}

   root -> constructed;
   root -> predefined;

   predefined -> numeric;
      numeric -> numeric_excact;
      numeric -> numeric_approximate;

   predefined -> string;
      string -> string_blob;
      string -> character;
        character -> character_fixed;
        character -> character_varying;
        character -> clob;

   predefined -> datetime;
      datetime -> date;
      datetime -> time;
      datetime -> timestamp;

   predefined -> boolean;
   predefined -> interval;

   root -> udt;

}