Database Engines:odbc

Which data types are present in a table? Professional

The data types that are actually present in a table when it is opened in a work area can be retrieved using the DbInfo() function and passing to it the constant ODBCDBO_ODBC_TO_XPP from the ODBCDBE.CH file:

USE Customer 

aTypes := DbInfo( ODBCDBO_ODBC_TO_XPP ) 

ASort( aTypes,,, {|a1,a2| a1[1] < a2[1] } ) 

? "DBMS-type => DDL-type" 
? 
AEval( aTypes, {|a| QOut( a[1], "=>", a[2] ) } ) 

The resulting output of this code can look as follows when the table is managed by MS SQL Server (refer to Data type mapping for an explanation of DDL-types and DBMS-types).

DBMS-type => DDL-type 

bit => L 
char => C 
numeric => N 
text => M 

The Customer table used for this example has more than four columns, but only four different data types are used in the table.

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