MySQL: ¿Cómo contar desde columnas por separado?

Question

Por lo general, me siento bastante confiado con las consultas SQL, sin embargo, este me tiene a mí rascándome la cabeza. Siento que esto, debería ser una solución rápida, pero simplemente no lo estoy viendo.

Estoy tratando de hacer un recuento de varios valores en la misma tabla, en una consulta.

No importa que "0000000000000000" solo represente una matriz de bytes vacía.

¿Hay alguna manera fácil de combinar estas consultas?

SELECT COUNT(ssn) 
FROM patients 
WHERE ssn="0000000000000000"; 

SELECT COUNT(firstname) 
FROM patients 
WHERE firstname="0000000000000000" 

SELECT COUNT(lastname) 
FROM patients 
WHERE lastname="0000000000000000" 

etc... 

Answer 1

Puede hacer algo como esto -

SELECT COUNT(ssn) AS patient_count, 'ssn' AS count_type 
FROM patients 
WHERE ssn="0000000000000000"; 
UNION 
SELECT COUNT(firstname) AS patient_count, 'firstname' AS count_type 
FROM patients 
WHERE firstname="0000000000000000" 
UNION 
SELECT COUNT(lastname) AS patient_count, 'lastname' AS count_type 
FROM patients 
WHERE lastname="0000000000000000" 

Answer 2

intento con UNIÓN

SELECT COUNT(ssn) 
FROM patients 
WHERE ssn="0000000000000000"; 
UNION 
SELECT COUNT(firstname) 
FROM patients 
WHERE firstname="0000000000000000" 
UNION  
SELECT COUNT(lastname) 
FROM patients 
WHERE lastname="0000000000000000" 

Answer 3

SELECT SUM(CASE WHEN ssn = '0000000000000000' THEN 1 ELSE 0 END) AS ssn_count, 
     SUM(CASE WHEN firstname = '0000000000000000' THEN 1 ELSE 0 END) AS first_count, 
     SUM(CASE WHEN lastname = '0000000000000000' THEN 1 ELSE 0 END) AS last_count 
    FROM patients 
    WHERE ssn = '0000000000000000' 
     OR firstname = '0000000000000000' 
     OR lastname = '0000000000000000' 

Answer 4

supongo que esto funcionaría?

SELECT * 
FROM 
(SELECT COUNT(ssn) AS ssn_count 
FROM patients 
WHERE ssn="0000000000000000") AS ssn 
CROSS JOIN 
(SELECT COUNT(firstname) AS firstname_count 
FROM patients 
WHERE firstname="0000000000000000") AS firstname 
CROSS JOIN 
(SELECT COUNT(lastname) AS lastname_count 
FROM patients 
WHERE lastname="0000000000000000") AS lastname