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aburningflame

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  1. SELECT * FROM character_item WHERE character_id=123   This is very efficient. Database engines are blazing fast.       SELECT * FROM character [code to programatically loop and check for user 123] ^INEFFICIENT     SELECT * FROM character WHERE user=123 (this will only return x items. where x is the # of items user 123 has) [code to programatically loop and assign the returned resultset to user 123's inventory] ^EFFICIENT   http://www.w3schools.com/sql/sql_where.asp   Keep hitting next chapter.   Good luck!
  2. Selects return a "ResultSet" Which is 0 or more rows based on your select statement. You can add a "WHERE clause" to your select to limit t he data being returned.   SELECT * FROM Character WHERE active=1   <<<Gets all Active Characters Lets say you had 50 characters, and 10 of these were "banned". The above statement would return 40 rows! Only the # of rows matching the criteria. With this resultset you can do what you will. Loop through it in your game, check values, etc etc etc     Steps I believe you should take: Download MySQL and MySQL workbench Practice Creating tables and then performing sql commands on those tables (SELECT, SELECT with where clauses, SELECT with inner joins, DELETES, INSERTS) etc etc.   Once  you are COMFORTABLE with the above. Then you can start looking into how to execute sql and loop through resultsets in whatever language you are using. Here is a small PSEUDOCODE example   ConnectionObject Creation Open Connection Execute Statement (Optional)Loop Through Reader & Process Rows Close Reader/Connection
  3. They have given you the correct answers. Based on your posts it seems you do not know much about Relational databases.   Character (Table) character_id name   item (Table) item_id name   character_item (Table) character_id item_id amount     Example Entries:   Character   1, Juicebox 2, Rupert   Item 1, HP Potion 2, MP Potion 3, XP Potion Character_Item 1,1,5   - Row 0 (Character 1 has HP Potion x5) 1,2,10 - Row 1 (Character 1 has MP Potion x10) 2,3,15 - Row 2 (Character 2 has XP Potion x15) 2,1,3   - Row 3 (Character 2 has HP Potion x3)   Executing this SQL: SELECT * From Character                                                    will bring back information for all characters (rows 0 and 1 in Character table) SELECT * FROM Character WHERE character_id=1            will bring back row 0 in Character Table "Juicebox" SELECT * FROM Item                                                            will bring back all rows in t he item table SELECT * FROM Item WHERE name='HP Potion'                  will bring back 1 row for every item named HP Potion SELECT * FROM Item WHERE item_id=1                              will bring back 1 row for item_id 1 (Row 0 - HP Potion) SELECT * FROM Character_Item                                          will bring back all rows SELECT * FROM Character_Item WHERE character_id=1    will only bring back row 0 and 1. SELECT * FROM Character_Item WHERE character_id=2     will only bring back row 2 and 3. SELECT * FROM Character_Item WHERE character_id=2 AND item_id=3   will only bring back row 2 (you can run something like this to see if a character has a certain item ID)     Here is some basic SQL: http://www.roseindia.net/mysql/mysql5/Mysql-select-statement.shtmlhttp://www.roseindia.net/mysql/mysql5/Mysql-select-statement.shtml     Note: SQL Server and MySQL both use SQL - there may be slight differences in syntax / keywords, however, the concepts are the same. I advise you to pickup mysql and mysql workbench and work on creating tables and writing queries such as:   SELECT queries INSERT queries (http://www.techonthenet.com/sql/insert.php) DELETE queries