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    <p>Error Code: 1005 -- there is a wrong primary key reference in your code</p> <p>usually it's due to a reference FK field not exist. might be you have typo mistake,or check case it should be same, or there's a field-type mismatch. FK-linked fields must match definitions exactly.</p> <p>Some Known causes may be :</p> <ol> <li>The two key fields type and/or size doesn’t match exactly. For example, if one is <code>INT(10)</code> the key field needs to be <code>INT(10)</code> as well and not <code>INT(11)</code> or <code>TINYINT</code>. You may want to confirm the field size using <code>SHOW</code> <code>CREATE</code> <code>TABLE</code> because Query Browser will sometimes visually show just <code>INTEGER</code> for both <code>INT(10)</code> and <code>INT(11)</code>. You should also check that one is not <code>SIGNED</code> and the other is <code>UNSIGNED</code>. They both need to be exactly the same.</li> <li>One of the key field that you are trying to reference does not have an index and/or is not a primary key. If one of the fields in the relationship is not a primary key, you must create an index for that field.</li> <li>The foreign key name is a duplicate of an already existing key. Check that the name of your foreign key is unique within your database. Just add a few random characters to the end of your key name to test for this.</li> <li>One or both of your tables is a <code>MyISAM</code> table. In order to use foreign keys, the tables must both be <code>InnoDB</code>. (Actually, if both tables are <code>MyISAM</code> then you won’t get an error message - it just won’t create the key.) In Query Browser, you can specify the table type.</li> <li>You have specified a cascade <code>ON</code> <code>DELETE</code> <code>SET</code> <code>NULL</code>, but the relevant key field is set to <code>NOT</code> <code>NULL</code>. You can fix this by either changing your cascade or setting the field to allow <code>NULL</code> values. </li> <li>Make sure that the Charset and Collate options are the same both at the table level as well as individual field level for the key columns.</li> <li>You have a default value (ie default=0) on your foreign key column </li> <li>One of the fields in the relationship is part of a combination (composite) key and does not have it’s own individual index. Even though the field has an index as part of the composite key, you must create a separate index for only that key field in order to use it in a constraint.</li> <li>You have a syntax error in your <code>ALTER</code> statement or you have mistyped one of the field names in the relationship</li> <li>The name of your foreign key exceeds the max length of 64 chars.</li> </ol> <p>for more details refer : <a href="http://verysimple.com/2006/10/22/mysql-error-number-1005-cant-create-table-mydbsql-328_45frm-errno-150/">MySQL Error Number 1005 Can’t create table</a></p>
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    1. POError Code: 1005. Can't create table '...' (errno: 150)
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    1. UShjpotter92
    1. This table or related slice is empty.
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    1. POError Code: 1005. Can't create table '...' (errno: 150)
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    1. COthe problem was that the foreign key charsets were not matching. Thanks for the answer.
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      1. USlamostreta
    2. CO`SHOW ENGINE INNODB STATUS` as mentioned in [this question](http://stackoverflow.com/questions/2799021/mysql-error-1005-hy000-cant-create-table-foo-sql-12c-4-errno-150) helped me diagnose my particular problem (PEBCAK, in my case...)
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    3. COdamn, even the it is a primary key. You need to create individual index for that key. thanks this solved my problem.
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