
/*********
MEASURE_VALUE_COMPLETENESS
Computing number of null values and the proportion to total records per field

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 IS NULL
		/*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
;
