• a5_finddupsgenie Function
• a5_get_recs_in_qry_local Function
• a5_paste_current_record Function
• a5_paste_from_clipboard Function
• a5_paste_new_record Function
• a5_put_rec_on_clipboard Function
• a5_rec_clip_has_data Function
• a5_records_undelete Function
• a5_remove_recs_genie Function
• a5_selected_records Function
• BOTTOM_PERCENT_RECORDS Function
• BOTTOM_RECORDS Function
• CHANGE_RECORD Method
• CURRENT_RECORD Function
• CURRENT_RECORD_NUMBER Function
• DBAVG Function
• DBCOUNT Function
• DBMAX Function
• DBMIN Function
• DBSUM Function
• DELETE_RECORD Method
• DELETED Function
• ENTER RECORD Method
• EVERY_RECORD_LIST Function
• FILTER_STRING Function
• form_qs_explicit Function
• IS_RECNO_IN Function
• LOOKUP Function
• LOOKUPC Function
• LOOKUPD Function
• LOOKUPL Function
• LOOKUPN Function
• MARKED Function
• page_records_get Function
• POP_STDDEV Function
• POP_VARIANCE Function
• RANDOM_PCT_RECORD_LIST Function
• RANDOM_PERCENT_RECORDS Function
• RANDOM_RECORD_LIST Function
• RANDOM_RECORDS Function
• RECORD_ADD Function
• RECORD_DELETE Function
• RECORD_UPDATE Function
• RUN_AVERAGE Function
• RUN_MAXIMUM Function
• RUN_MINIMUM Function
• RUN_STDDEV Function
• RUN_VARIANCE Function
• SAMPLE_RECORDS Function
• STDDEV Function
• TOP_PERCENT_RECORDS Function
• TOP_RECORDS Function
• TOP_RECORDS_LIST Function
• TOP_RECORDS_PCT_LIST Function
• VARIANCE Function

LOOKUPD Function

Syntax

Arguments

matchtype

A 1-character string that specifies which lookup table record should supply the value if more than one record matches the Key_Value. "F" = First "L" = Last "C" = Closest match Closest match uses the first occurrence of the closest inexact match if an exact match does not exist, otherwise it uses the first occurrence of an exact match.

keyvalue

The value of a key to search for. The type of Key_Value must be the same as the type of the keys in the index specified by Index_Name. Any type

result_expression

The name of a field in the Lookup_Table or a valid expression which may contain one or more fields.

tablename

The fully qualified name of a table. If you omit the drive and path, Alpha Anywhere searches the directory of the current database.

tagname

The name of an index in the index lookup table that may contain the Key_Value.

Description

Returns the value of a date expression in an external table.

Discussion

LOOKUPD() searches an external lookup table ( Lookup_Table ) for an indexed record matching the Key_Value, and returns the date value in Lookup_Expression from the matching record. Alpha Anywhere performs an indexed search of the Lookup_Table using the Index_Name index. Note : If a record with a matching Key_Value is not found, Alpha Anywhere returns a blank value.

Assume that the Invoice and Customer tables contain the following records and that the index, CUSTOMER_ID, exists on the CUST_ID field in Customer : If the following expression defines a calculated field or global variable for the Customer table, Alpha Anywhere returns the date of the last invoice record that matches the current Customer record:

CUSTOMER

CUST_ID

LAST_NAME

C001

Gorby

C002

Peabody

C003

Rebo

INVOICE

INV_NO

CUST_ID and INV_DATE

I001

C001 06/07/1993

I002

C002 06/07/1993

I003

C003 06/08/1993

I004

C004 06/08/1993

I005

C001 03/15/1993

lookupd("L", CUST_ID, "INV_DATE", "C:\DATABASES\INVOICE.DBF", "CUSTOMER_ID")
-> 03/15/1993, if the current customer record is C001

The Customer identification field ( CUST_ID ) exists in both tables. In the above expression, CUST_ID is the field from the Customer table field and CUSTOMER_ID is the name of an index on the CUST_ID field from the INVOICE table. Note : You can use TABLE.FILENAME_GET()to get the fully qualified name of a table.

See Also

• Record Functions
• Overview: Functions and Expressions
• A Procedure for Building Complex Expressions