Rivalry2

Базы данных: SQL (DQL)
2026-02-26 23:12 Diff
https://ru.hexlet.io/courses/sql-dql/lessons/group/theory_unit
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А на производительность это как-то влияет? &quot;,&quot;plain_title&quot;:&quot;; забыли в решении поставить. Вопрос: безопаснее делать COUNT(*) вместо COUNT(id), так как не привязываемся к столбцу, а просто считаем количество и в случае смены имени столбца запрос продолжит работать. А на производительность это как-то влияет?  &quot;,&quot;creator&quot;:{&quot;public_name&quot;:&quot;Ivan Trofimov&quot;,&quot;id&quot;:132024,&quot;is_tutor&quot;:false},&quot;comments&quot;:[{&quot;creator&quot;:{&quot;public_name&quot;:&quot;Kirill Mokevnin&quot;,&quot;id&quot;:1,&quot;is_tutor&quot;:false},&quot;id&quot;:20051,&quot;body&quot;:&quot;1. `;` не нужна при программном выполнении запросов.\n1. `COUNT(*)` просто традиция), никакго особого смысла.\n1. Чтобы оценивать производительность, нужно смотреть `explain`.&quot;,&quot;topic_id&quot;:9778}],&quot;communitable&quot;:{&quot;parent_entity_name&quot;:null,&quot;parent_entity_url&quot;:null,&quot;entity_name&quot;:&quot;Группировка&quot;,&quot;entity_url&quot;:null,&quot;active&quot;:true}},{&quot;id&quot;:21466,&quot;title&quot;:&quot;символы наезжают друг на друга в терминале при переносе строки(&quot;,&quot;plain_title&quot;:&quot;символы наезжают друг на друга в терминале при переносе строки( &quot;,&quot;creator&quot;:{&quot;public_name&quot;:&quot;Максим Торбург&quot;,&quot;id&quot;:64077,&quot;is_tutor&quot;:false},&quot;comments&quot;:[{&quot;creator&quot;:{&quot;public_name&quot;:&quot;Kirill Mokevnin&quot;,&quot;id&quot;:1,&quot;is_tutor&quot;:false},&quot;id&quot;:45556,&quot;body&quot;:&quot;А можешь скрин приложить? &quot;,&quot;topic_id&quot;:21466},{&quot;creator&quot;:{&quot;public_name&quot;:&quot;Kirill Mokevnin&quot;,&quot;id&quot;:1,&quot;is_tutor&quot;:false},&quot;id&quot;:46430,&quot;body&quot;:&quot;О, крутяк). Получилось устроится?&quot;,&quot;topic_id&quot;:21466},{&quot;creator&quot;:{&quot;public_name&quot;:&quot;Максим Торбург&quot;,&quot;id&quot;:64077,&quot;is_tutor&quot;:false},&quot;id&quot;:46280,&quot;body&quot;:&quot;Попробуй длинную строку просто ввести. Забыл уже, зачем был нужен перевод строки :)\nКирилл, кстати, тебе привет от Кодикса, ходил к ним в гости на собеседование :)&quot;,&quot;topic_id&quot;:21466},{&quot;creator&quot;:{&quot;public_name&quot;:&quot;Максим Торбург&quot;,&quot;id&quot;:64077,&quot;is_tutor&quot;:false},&quot;id&quot;:46580,&quot;body&quot;:&quot;Нет, я пока слаб, но мне очень понравилось, что они знают о вас и вы им нравитесь, это приятно. И вообще импонирует эта компания :)&quot;,&quot;topic_id&quot;:21466}],&quot;communitable&quot;:{&quot;parent_entity_name&quot;:null,&quot;parent_entity_url&quot;:null,&quot;entity_name&quot;:&quot;Группировка&quot;,&quot;entity_url&quot;:null,&quot;active&quot;:true}},{&quot;id&quot;:10404,&quot;title&quot;:&quot;У меня перестали выводиться названия колонок, когда делаю `select` (так же, как и на видео). \nЭто можно как-то исправить?\nИли это баг postgres`а?&quot;,&quot;plain_title&quot;:&quot;У меня перестали выводиться названия колонок, когда делаю select (так же, как и на видео).  Это можно как-то исправить? Или это баг postgres`а? &quot;,&quot;creator&quot;:{&quot;public_name&quot;:&quot;Максим Даценко&quot;,&quot;id&quot;:138074,&quot;is_tutor&quot;:false},&quot;comments&quot;:[{&quot;creator&quot;:{&quot;public_name&quot;:&quot;Kirill Mokevnin&quot;,&quot;id&quot;:1,&quot;is_tutor&quot;:false},&quot;id&quot;:21510,&quot;body&quot;:&quot;Вы сейчас про запросы на хекслете или в своем локальном окружении?&quot;,&quot;topic_id&quot;:10404},{&quot;creator&quot;:{&quot;public_name&quot;:&quot;Максим Даценко&quot;,&quot;id&quot;:138074,&quot;is_tutor&quot;:false},&quot;id&quot;:21525,&quot;body&quot;:&quot;Про локальное окружение.\nУдалось решить проблему переустановкой postgres`a.&quot;,&quot;topic_id&quot;:10404}],&quot;communitable&quot;:{&quot;parent_entity_name&quot;:null,&quot;parent_entity_url&quot;:null,&quot;entity_name&quot;:&quot;Группировка&quot;,&quot;entity_url&quot;:null,&quot;active&quot;:true}},{&quot;id&quot;:11523,&quot;title&quot;:&quot;А почему alias не срабатывает?\n```\nselect category, count(category) as count_goods from goods group by category having count_goods  &gt; 1;\n```\nОшибка:\n```\nERROR:  column \&quot;count_goods\&quot; does not exist\nLINE 1: ...s count_goods from goods group by category having count_good...\n                                                             ^\n```&quot;,&quot;plain_title&quot;:&quot;А почему alias не срабатывает?  select category, count(category) as count_goods from goods group by category having count_goods  &gt; 1;  Ошибка:  ERROR:  column \&quot;count_goods\&quot; does not exist LINE 1: ...s count_goods from goods group by category having count_good...                                                              ^  &quot;,&quot;creator&quot;:{&quot;public_name&quot;:&quot;Максим Козляков&quot;,&quot;id&quot;:146180,&quot;is_tutor&quot;:false},&quot;comments&quot;:[{&quot;creator&quot;:{&quot;public_name&quot;:&quot;Kirill Mokevnin&quot;,&quot;id&quot;:1,&quot;is_tutor&quot;:false},&quot;id&quot;:24007,&quot;body&quot;:&quot;Из документации:\n\nThe HAVING clause is evaluated before the SELECT - so the server doesn&#x27;t yet know about that alias.&quot;,&quot;topic_id&quot;:11523}],&quot;communitable&quot;:{&quot;parent_entity_name&quot;:null,&quot;parent_entity_url&quot;:null,&quot;entity_name&quot;:&quot;Группировка&quot;,&quot;entity_url&quot;:null,&quot;active&quot;:true}},{&quot;id&quot;:7108,&quot;title&quot;:&quot;можно ли использовать having к полям которые не участвуют в группировке ?&quot;,&quot;plain_title&quot;:&quot;можно ли использовать having к полям которые не участвуют в группировке ? &quot;,&quot;creator&quot;:{&quot;public_name&quot;:&quot;Андрей Свитлов&quot;,&quot;id&quot;:94912,&quot;is_tutor&quot;:false},&quot;comments&quot;:[{&quot;creator&quot;:{&quot;public_name&quot;:&quot;Kirill Mokevnin&quot;,&quot;id&quot;:1,&quot;is_tutor&quot;:false},&quot;id&quot;:13180,&quot;body&quot;:&quot;Прямо из документации:\n\n```\nThe fundamental difference between WHERE and HAVING is this: WHERE selects input rows before groups and aggregates are computed (thus, it controls which rows go into the aggregate computation), whereas HAVING selects group rows after groups and aggregates are computed. Thus, the WHERE clause must not contain aggregate functions; it makes no sense to try to use an aggregate to determine which rows will be inputs to the aggregates. On the other hand, the HAVING clause always contains aggregate functions. (Strictly speaking, you are allowed to write a HAVING clause that doesn&#x27;t use aggregates, but it&#x27;s seldom useful. 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