MySqli查询选择所有字段不为空

我有一个表，我想计算字段不为空的字段数。如何返回结果

---

选择*FROM

fakelos2

，其中字段不为空

而不是are use is，而要计算特定字段的行数，可以使用如下计数函数：

SELECT count(*) 
FROM fakelos2 
WHERE fields is not null

SELECT 
((CASE WHEN field1 IS NULL THEN 1 ELSE 0 END)
+ (CASE WHEN field2 IS NULL THEN 1 ELSE 0 END)
+ (CASE WHEN field3 IS NULL THEN 1 ELSE 0 END)
...
...
+ (CASE WHEN field10 IS NULL THEN 1 ELSE 0 END)) AS sum_of_nulls
FROM fakelos2

现在，您必须计算每个字段，然后使用用例，如下所示：

SELECT count(*) 
FROM fakelos2 
WHERE fields is not null

SELECT 
((CASE WHEN field1 IS NULL THEN 1 ELSE 0 END)
+ (CASE WHEN field2 IS NULL THEN 1 ELSE 0 END)
+ (CASE WHEN field3 IS NULL THEN 1 ELSE 0 END)
...
...
+ (CASE WHEN field10 IS NULL THEN 1 ELSE 0 END)) AS sum_of_nulls
FROM fakelos2