mysql-8.0

问题 I've setup a fiddle here: https://www.db-fiddle.com/f/snDGExYZgoYASvWkDGHKDC/2 But also: Schema: CREATE TABLE `scores` ( `id` bigint unsigned NOT NULL AUTO_INCREMENT, `shift_id` int unsigned NOT NULL, `employee_name` varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL, `score` double(8,2) unsigned NOT NULL, `created_at` timestamp NOT NULL, PRIMARY KEY (`id`) ); INSERT INTO scores(shift_id, employee_name, score, created_at) VALUES (1, "John", 6.72, "2020-04-01 00:00:00"), (1, "Bob", 15.71, "2020

问题 I've setup a fiddle here: https://www.db-fiddle.com/f/snDGExYZgoYASvWkDGHKDC/2 But also: Schema: CREATE TABLE `scores` ( `id` bigint unsigned NOT NULL AUTO_INCREMENT, `shift_id` int unsigned NOT NULL, `employee_name` varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL, `score` double(8,2) unsigned NOT NULL, `created_at` timestamp NOT NULL, PRIMARY KEY (`id`) ); INSERT INTO scores(shift_id, employee_name, score, created_at) VALUES (1, "John", 6.72, "2020-04-01 00:00:00"), (1, "Bob", 15.71, "2020

问题 I've setup a fiddle here: https://www.db-fiddle.com/f/snDGExYZgoYASvWkDGHKDC/2 But also: Schema: CREATE TABLE `scores` ( `id` bigint unsigned NOT NULL AUTO_INCREMENT, `shift_id` int unsigned NOT NULL, `employee_name` varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL, `score` double(8,2) unsigned NOT NULL, `created_at` timestamp NOT NULL, PRIMARY KEY (`id`) ); INSERT INTO scores(shift_id, employee_name, score, created_at) VALUES (1, "John", 6.72, "2020-04-01 00:00:00"), (1, "Bob", 15.71, "2020

问题 I have forgotten my root password and I am following the official page to reset my password.I have followed the exact steps. When I run the sql-init.txt file my bash gets stuck and the installation never completes. C:\Windows\system32>cd "C:\Program Files\MySQL\MySQL Server 8.0\bin" C:\Program Files\MySQL\MySQL Server 8.0\bin>mysqld --defaults-file="C:\\ProgramData\\MySQL\\MySQL Server 8.0\\my.ini" --init-file=C:\\mysql-init.txt --console 2019-03-04T12:06:43.930229Z 0 [Warning] [MY-010915]

问题 I have forgotten my root password and I am following the official page to reset my password.I have followed the exact steps. When I run the sql-init.txt file my bash gets stuck and the installation never completes. C:\Windows\system32>cd "C:\Program Files\MySQL\MySQL Server 8.0\bin" C:\Program Files\MySQL\MySQL Server 8.0\bin>mysqld --defaults-file="C:\\ProgramData\\MySQL\\MySQL Server 8.0\\my.ini" --init-file=C:\\mysql-init.txt --console 2019-03-04T12:06:43.930229Z 0 [Warning] [MY-010915]

问题 I have the following string: "a,b,c,d" and I want to convert it into a json array, something like this ["a","b","c","d"] is there any MySQL 8 function that can achieve this? 回答1: Try: SELECT CAST( CONCAT('["', REPLACE('a,b,c,d', ',', '","'), '"]') AS JSON ); See dbfiddle. 回答2: select json_array("a,b,c,d"); +-----------------------+ | json_array("a,b,c,d") | +-----------------------+ | ["a,b,c,d"] | +-----------------------+ 来源： https://stackoverflow.com/questions/56958056/mysql-8-split-string

问题 I have the following string: "a,b,c,d" and I want to convert it into a json array, something like this ["a","b","c","d"] is there any MySQL 8 function that can achieve this? 回答1: Try: SELECT CAST( CONCAT('["', REPLACE('a,b,c,d', ',', '","'), '"]') AS JSON ); See dbfiddle. 回答2: select json_array("a,b,c,d"); +-----------------------+ | json_array("a,b,c,d") | +-----------------------+ | ["a,b,c,d"] | +-----------------------+ 来源： https://stackoverflow.com/questions/56958056/mysql-8-split-string

问题 I am trying to do CRUD operations using Dapper Extensions. But I am getting error while inserting data to MySQL database as follows: Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near [......] at line [....] If I use MSSQL database, Dapper Extensions is working correctly. Why I am getting this error with MySQL? 回答1: The error is because Dapper Extensions is generating the query for SQL server (by default

问题 I have a table with the below json data type column in a table PRICING_DATA pricingJson type json nullable And I am using the sql to query the table. select * from `PRICING_DATA` where `pricingJson`->"$.product.productFamily" = "Compute Instance"; The sample json data is like below { "product": { "productFamily": "Compute Instance", "attributes": { "enhancedNetworkingSupported": "Yes",..... But the query is not returning any rows. What am I doing wrong here? Json raw string from the db seems

问题 I have two tables that I need to join iteratively within a loop to create values to populate one of the tables. I'm primarily looking for the cleanest way to do a one-period-shifted join, details below. Sample of the two input tables below: DROP TABLE IF EXISTS holdings; CREATE TABLE holdings (date DATE NOT NULL ,ticker CHAR(4) NOT NULL ,wgt DECIMAL(5,2) ,PRIMARY KEY(date,ticker) ); INSERT INTO holdings VALUES ('2019-03-29','MTUM',0.2), ('2019-03-29','QUAL',0.2), ('2019-03-29','SIZE',0.2), (