The SQL preprocessors supplied with this system use two data structures: 
	 
 
	 
 
		   
		   
		   
		   
			  
				| Data Structure 
				 | 
 
				Description 
				 | 
 
				Function 
				 | 
 
			 
 
		  
 
		   
			  
				| SQLCA 
				 | 
 
				SQL Communications Area 
				 | 
 
				Returns status and error information. 
				 | 
 
			 
 
			  
				| SQLDA 
				 | 
 
				SQL Descriptor Area 
				 | 
 
				 Describes the variables used in dynamic SQL statements. 
				 |