
/*********
FIELD_IS_PRIMARY_KEY

Primary Key - verify that values in fields where isPrimaryKey == Yes are unique

Parameters used in this template:
schema = @schema
cdmTableName = @cdmTableName
cdmFieldName = @cdmFieldName
{@cohort & '@runForCohort' == 'Yes'}?{
cohortDefinitionId = @cohortDefinitionId
cohortDatabaseSchema = @cohortDatabaseSchema
cohortTableName = @cohortTableName
}
**********/


SELECT 
    num_violated_rows, 
    CASE 
        WHEN denominator.num_rows = 0 THEN 0 
        ELSE 1.0*num_violated_rows/denominator.num_rows 
    END AS pct_violated_rows, 
    denominator.num_rows AS num_denominator_rows
FROM
(
    SELECT 
        COUNT_BIG(violated_rows.violating_field) AS num_violated_rows
    FROM
    (
        /*violatedRowsBegin*/
        SELECT 
            '@cdmTableName.@cdmFieldName' AS violating_field, 
            cdmTable.* 
        FROM @schema.@cdmTableName cdmTable
            {@cohort & '@runForCohort' == 'Yes'}?{
                JOIN @cohortDatabaseSchema.@cohortTableName c 
                    ON cdmTable.person_id = c.subject_id
                    AND c.cohort_definition_id = @cohortDefinitionId
            }
        WHERE cdmTable.@cdmFieldName IN ( 
            SELECT 
                @cdmFieldName 
            FROM @schema.@cdmTableName
            GROUP BY @cdmFieldName
            HAVING COUNT_BIG(*) > 1 
        )
        /*violatedRowsEnd*/
    ) violated_rows
) violated_row_count,
( 
    SELECT 
        COUNT_BIG(*) AS num_rows
    FROM @schema.@cdmTableName cdmTable
        {@cohort & '@runForCohort' == 'Yes'}?{
            JOIN @cohortDatabaseSchema.@cohortTableName c 
                ON cdmTable.person_id = c.subject_id
                AND c.cohort_definition_id = @cohortDefinitionId
        }
) denominator
;
