• A5_COMBINE_FILTERS Function
• A5_GET_RECORDS_IN_QUERY Function
• A5_HAS_BASE_FILTER Function
• A5_REPLACE_PARAMETERS_MULTI Function
• a5_save_query Function
• a5_show_mru_query Function
• a5_toggle_qbf_genie Function
• a5cs_analyzesimplequery Function
• a5cs_determineoptimalquerylocation Function
• a5cs_getquerylocation Function
• CONVERT_EXPRESSION Function
• CROSSLEVEL Function
• EXPRESSION_COMMON_FILTER_ELIMINATE Function
• EXPRESSION_COMMON_ORDER_ELIMINATE Function
• EXPRESSION_INFO Function
• EXPRESSION_SUBEXPRESSION_ELIMINATE Function
• FLATTENQUERY Function
• MRU_QUERY Function
• QUERY_FILTER_GET Function
• query_load Function
• QUERY_ORDER_GET Function
• query_save Function
• REPLACE_PARAMETERS Function
• TYPEOF Function
• UNIQUE_KEY_VALUE Function

UNIQUE_KEY_VALUE Function

Syntax

Description

When used in a filter expression, return only unique values for key.

Discussion

The UNIQUE_KEY_VALUE() function is a special function that returns .T. (TRUE). Its sole purpose is for use in a filter expression where you want to return only those records with unique key values that satisfy the filter expression. Note : Using the UNIQUE_KEY_VALUE() function in a query filter is equivalent to selecting "U" for the query.options flag when using the <TBL>.QUERY_CREATE()method. The advantage of this function over setting the appropriate flag in query.options is that many Alpha Anywhere methods and functions prompt for a filter, but do not let you specify query options.

Example

This will produce a report showing all type 'A' customers sorted by state:

report.preview("customer", "type = 'A' ", "state")

This will produce a report showing the first type 'A' customer in each state:

report.preview("customer", "type = 'A' .and. unique_key_value() ", "state")

See Also

• Query Functions and Methods