Warning: mysql_num_rows() expects parameter

1 ===== Warning: mysql_num_rows() expects parameter 1 to be resource, boolean given in C:webroot\app\app\customer.php on line 627
2 ===== Warning: mysql_fetch_row() expects parameter 1 to be resource, boolean given in C:\webroot\app\app\customer.php on line 101
3 ===== Warning: mysql_num_rows() expects parameter 1 to be resource, boolean given in C:\webroot\app\app\customer.php on line 248
4 ===== Undefined variable: currMin in C:\webroot\app\app\customer.php on line 670
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Warning: mysql_num_rows() expects parameter

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