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| -- 6. Какая функция позволяет выполнить замену NULL значения на значимую величину? | ||
| -- COALESCE, NULLIF, CASE WHEN | ||
| SELECT COALESCE(NULL, 'value') AS coalesce_example; |
Collaborator
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NULLIF -????
CASE WHEN - это не функция, а выражение
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| -- 7. Какая функция (функции) позволяет получить: | ||
| -- a. Часть строки, удовлетворяющую заданной маске? | ||
| -- SUBSTRING, REGEXP_MATCH, REGEXP_REPLACE |
Collaborator
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Где примеры применения еще двух функций?
| SELECT LEFT('example string', 10) AS left_example; | ||
| -- c. Все символы справа, начиная с указанной позиции | ||
| -- RIGHT, SUBSTRING | ||
| SELECT RIGHT('example string', 6) AS right_example; |
Collaborator
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Не верное использование второго аргумента
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| -- 8. Какая функция используется для округления числа до 2-х знаков после запятой? | ||
| -- ROUND, TRUNC, CAST | ||
| SELECT ROUND(123.4567, 2) AS round_example; |
| UPPER(SUBSTRING('строковые' FROM 1 FOR 1)) || SUBSTRING('строковые' FROM 2) || ' ' || | ||
| UPPER(SUBSTRING('функции' FROM 1 FOR 1)) || SUBSTRING('функции' FROM 2) || ' ' || | ||
| UPPER(SUBSTRING('PostgreSQL' FROM 1 FOR 1)) || SUBSTRING('PostgreSQL' FROM 2) | ||
| AS initcap_string; |
Collaborator
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Хочу увидеть логическое решение
| -- c. Замените в массиве элемент sqlserver на postgres | ||
| SELECT ARRAY_REPLACE(ARRAY['sql', 'sqlserver', 'database', 'plsql'], 'sqlserver', 'postgres') AS replaced_array; | ||
| -- d. Верните из полученного массива последний элемент | ||
| SELECT (ARRAY_REPLACE(ARRAY['sql', 'sqlserver', 'database', 'plsql'], 'sqlserver', 'postgres'))[4] AS last_element; |
Collaborator
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Разве сказано вернуть 4-й элемент? Вернуть последний!!!
Collaborator
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Необходимо внести исправления в соответствии с комментариями.
Collaborator
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Все ок! |
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