HAVING yan tümcesi

Şunlar için geçerlidir: Databricks SQL Databricks Runtime

Tarafından GROUP BY üretilen sonuçları belirtilen koşula göre filtreler. Genellikle bir GROUP BY cümlesiyle birlikte kullanılır.

Sözdizimi

HAVING boolean_expression

Parametreler

• boolean_expression

  Herhangi bir ifade'nin bir BOOLEAN türüne sonuç olarak değerlendirildiği. veya gibi ANDOR mantıksal işleçler kullanılarak iki veya daha fazla ifade birleştirilebilir.

  Maddede HAVING belirtilen ifadeler yalnızca şu ifadelere atıfta bulunabilir:

  • Sabit ifadeler
  • GROUP BY'da görünen ifadeler
  • Toplama işlevleri

Örnekler

> CREATE TABLE dealer (id INT, city STRING, car_model STRING, quantity INT);
> INSERT INTO dealer VALUES
    (100, 'Fremont' , 'Honda Civic' , 10),
    (100, 'Fremont' , 'Honda Accord', 15),
    (100, 'Fremont' , 'Honda CRV'   , 7),
    (200, 'Dublin'  , 'Honda Civic' , 20),
    (200, 'Dublin'  , 'Honda Accord', 10),
    (200, 'Dublin'  , 'Honda CRV'   , 3),
    (300, 'San Jose', 'Honda Civic' , 5),
    (300, 'San Jose', 'Honda Accord', 8);

-- `HAVING` clause referring to column in `GROUP BY`.
> SELECT city, sum(quantity) AS sum FROM dealer GROUP BY city HAVING city = 'Fremont';
  Fremont  32

-- `HAVING` clause referring to aggregate function.
> SELECT city, sum(quantity) AS sum FROM dealer GROUP BY city HAVING sum(quantity) > 15;
  Dublin  33
 Fremont  32

-- `HAVING` clause referring to aggregate function by its alias.
> SELECT city, sum(quantity) AS sum FROM dealer GROUP BY city HAVING sum > 15;
  Dublin  33
 Fremont  32

-- `HAVING` clause referring to a different aggregate function than what is present in
-- `SELECT` list.
> SELECT city, sum(quantity) AS sum FROM dealer GROUP BY city HAVING max(quantity) > 15;
 Dublin  33

-- `HAVING` clause referring to constant expression.
> SELECT city, sum(quantity) AS sum FROM dealer GROUP BY city HAVING 1 > 0 ORDER BY city;
   Dublin  33
  Fremont  32
 San Jose  13

-- `HAVING` clause without a `GROUP BY` clause.
> SELECT sum(quantity) AS sum FROM dealer HAVING sum(quantity) > 10;
  78

İlgili makaleler

• GROUP BY
• QUALIFY
• SELECT