Created
August 21, 2020 17:04
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MySQL рецепты
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-- Временные таблицы в MySQL | |
-- Создание пустой таблицы: | |
CREATE TEMPORARY TABLE `tmp_table` ( | |
`id` int(11) unsigned NOT NULL AUTO_INCREMENT, | |
`name` varchar(255) NOT NULL, | |
`price` decimal(11,2) unsigned NOT NULL DEFAULT '0.00', | |
`sef` varchar(255) NOT NULL, | |
`text` text NOT NULL, | |
`approve` tinyint(1) NOT NULL DEFAULT '1', | |
`date_add` int(11) unsigned NOT NULL DEFAULT '0', | |
PRIMARY KEY (`id`) | |
) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=1; | |
-- Создание временной таблицы из структуры другой: | |
CREATE TEMPORARY TABLE `tmp_table` LIKE `prods`; | |
-- Клонирование таблицы: | |
CREATE TEMPORARY TABLE `tmp_table` SELECT * FROM `prods`; | |
-- Создание и наполнение из нескольких таблиц: | |
CREATE TEMPORARY TABLE `tmp_table` | |
SELECT | |
`prods`.`name`, | |
`urls`.`sef` | |
FROM | |
`prods` | |
LEFT JOIN | |
`urls` | |
ON | |
`prods`.`id` = `urls`.`prods_id` | |
WHERE | |
`prods`.`approve` = 1; | |
-- ########################################################## | |
-- Получить текст до дефиса | |
SELECT SUBSTRING(`field`, 1, (POSITION("-" IN `field`) -1)) AS `new_field` FROM `table`; | |
-- Замена в тексте | |
UPDATE `table` SET `field` = REPLACE(`field`, 'старый текст', 'новый текст'); | |
-- Возраст (кол-во лет) из даты YYYY-MM-DD | |
SELECT TIMESTAMPDIFF(YEAR, `birth_date`, CURDATE()) AS `age` FROM `table`; | |
-- Или из трех отдельных полей даты рождения: | |
SELECT TIMESTAMPDIFF(YEAR, CONCAT_WS('-', `year`, `months`, `day`), CURDATE()) AS `age` FROM `table`; | |
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