Some examples of tcl and sqlite usage:

NOTE: the name of the database is opendb

   * Retrieve the names of the tables stored in a sqlite database:
======
   set tableNames [opendb eval {SELECT tbl_name FROM sqlite_master}]
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   * Retrieve the names of the columns (variable columnName):
======
   opendb eval "SELECT * FROM nuno LIMIT 1" x {set columnName $x(*)} 
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[jnc] You can also use the `PRAGMA` statement `table_info(table_name`) to retrieve column information. See http://sqlite.org/pragma.html for a list of all `PRAGMA` statements.

   * Retrieve the row data from a table


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