mysql-5.7

问题 I have a MySQL 5.7 instance running without problems on Ubuntu 16, but when i try to install any other package or try to update existing ones through apt-get, i get the following error: # apt-get upgrade Setting up mysql-server-5.7 (5.7.20-0ubuntu0.16.04.1) ... Checking if update is needed. Checking server version. Running queries to upgrade MySQL server. mysql_upgrade: [ERROR] 1146: Table 'mysql.plugin' doesn't exist mysql_upgrade failed with exit status 5 dpkg: error processing package

问题 I have a JSON field to save post's tags. id:1, content:'...', tags: ["tag_1", "tag_2"] id:2, content:'...', tags: ["tag_3", "tag_2"] id:3, content:'...', tags: ["tag_1", "tag_2"] I just want to list all tags with their popularities (or even without them) something like this: tag_2: 3, tag_1: 2, tag_3: 1 回答1: Here's the setup: create table t ( id serial primary key, content json); insert into t set content = '{"tags": ["tag_1", "tag_2"]}'; insert into t set content = '{"tags": ["tag_3", "tag_2

问题 I need to create a user with a six character password in new MySQL on my mac. I know that the lowest setting in 5.7 will allows only eight characters. Is there any way to go around that? I type in CREATE USER 'newsier'@'localhost' IDENTIFIED BY 'special' It outputs the error ERROR 1819 (HY000): Your password does not satisfy the current policy requirements 回答1: You are using the password validation plugin. By default it only allows 8 characters and longer passwords. Because it can't check the

问题 I'm still pretty new to handling JSON fields in MySQL. All the solutions I've come across deal with objects that have key/values; unable to find one that handles JSON arrays. Anyways, what I want to do is to be able to select all rows where the interestIds contain 2 in them. How do I do that? Thanks. Users table +----+-------------+ | id | interestIds | +----+-------------+ | 1 | [1, 2] | | 2 | [3, 2] | | 3 | [2, 4] | +----+-------------+ Sample test query: SET @userId = 2; SELECT * FROM

问题 I try to tune InnoDB Buffer Pool Flushing parameters. In MySQL 5.7 manual innodb_lru_scan_depth * innodb_buffer_pool_instances = amount of work performed by the page cleaner thread each second My question is : How can I calculate the amount of work performed by the page cleaner thread each second? 回答1: Run the SQL command: SHOW GLOBAL STATUS LIKE 'Innodb_buffer_pool_pages_flushed' Once every second. Compare the value to the previous second. The difference of that value from one second to the

问题 I have a requirement to get count of continuous dates in leaves table. CREATE TABLE leaves( id INT AUTO_INCREMENT PRIMARY KEY , employee_id INT NOT NULL, leave_request_id INT NOT NULL, leave_date DATE NOT NULL, start_time time NOT NULL DEFAULT '00:00:00', end_time time NOT NULL DEFAULT '00:00:00' ); INSERT INTO `leaves` (`id`, `leave_request_id`, `leave_date`, `employee_id`, `start_time`, `end_time`) VALUES (NULL, '1', '2019-10-01', '2', '09:00:00.000000', '18:00:00.000000'), (NULL, '1',

问题 I am new to laravel and I am having an issue with DB problem. I have disabled 'only_full_group_by' sql_mode by editing /etc/mysql/my.cnf file. And I checked sql_mode for both global and session using SELECT @@GLOBAL.sql_mode; and SELECT @@SESSION.sql_mode; and confirmed that sql_mode no longer has only_full_group_by . However, when I make a request through postman, it gives me the error saying this is incompatible with sql_mode=only_full_group_by . I am so confused. Why do I get this error

问题 The issue is that ş and s are interpreted by MySQL as identical values. I'm new to MySQL, so I have no idea which collations would view them as unique. The collations that I've tried using which don't work are: utf8_general_ci utf8_unicode_520_ci utf8mb4_unicode_ci utf8mb4_unicode_520_ci Does anybody know which collation to use? P.S. I also really need the collation to interpret emojis and other non-Latin characters, and, to my knowledge of MySQL and collations, the only collation able to do

问题 This question already has answers here : Retrieving the last record in each group - MySQL (26 answers) Closed 3 years ago . I am using MYSQL 5.7. I want to get the recent rows with distinct device_id . I tried these queries: Query 1 SELECT `table`.`id`, `table`.`device_id` FROM `table` WHERE (id IN (SELECT id FROM (SELECT * FROM table ORDER BY date_modified DESC) AS last_modified GROUP BY device_id) and device_id <> ''); +----+------------------+ | id | device_id | +----+------------------+ |

问题 Having a lot of trouble installing mysql 5.7 on Mac Mojave, (ran 'brew install mysql@5.7') on initial install, got msg saying postinstall was not completed successfully (please see msg below). So, after I delete everything in the directory /usr/local/var/mysql (which mysql says is not empty), I STILL get same message when re-running postinstall command ... (which is quite annoying seems MySQL is populating the data dir then complaining it is not empty?!) [08:02:48][~/tmp]#brew postinstall