I have a MySQL 5.7 table with 8 million distinct email records. I have another table with about 2 million records with emails that are not distinct. I want to see the emails from the larger table that exist in…
(SELECT 1 `a`) UNION (SELECT 2 `a`) ORDER BY `a` DESC LIMIT 1 is a perfectly valid query in MySQL and as far as I can tell the same as SELECT 1 `a` UNION SELECT 2 `a` ORDER BY `a`…
I recently upgraded the character set of my MySQL database from utf8mb3 to utf8mb4. One of my table columns is defined as an ENUM('saved', 'updated', 'deleted') NOT NULL DEFAULT 'saved'. However, after performing the charset upgrade, I noticed that the…
My team and I are attempting to upgrade our multi-tenancy AWS RDS/MySQL instance from MySQL 5.7 to 8. After trying the upgrade, we received a report showing a large number of errors for the customers, and lineitems tables. Example Errors…
I am using phpMyAdmin that uses MySQL version 5.7. I have a database table called condensed which contains millions of unique emails with multiple "send dates", among other columns. Some of the emails will have a NULL send date. Focusing…
Please refer to this db fiddle (SQL also pasted below): https://www.db-fiddle.com/f/bJ5FfufvP9GHPYtBhkywdP/5 I would like to show rows from the "mpr_metrics" table that have NO associated reviews. But here's the catch: if there is a metric with an associated review, AND…
I Am builing a small application. where I Need to create MySQL Stored procedure via python using mysql Connector. I have tried following code. But getting an following error that "Commands out of sync; you can't run this command now."…
I have these three tables: hotel hotel_id hotel_name room room_id hotel_id room_price room_id start_date price Where ‘start_date’ stores the date the price changed to ‘price’. I know how to query the database to get the price for a given room_id…
In MySQL5.7, I have a column having 28 columns and 4000 rows. I want to bring rows having data for all or rows having data for maximum columns first and then for the other rows to progressively follow. How do…
I have this data in mysql 5.7 drop table if exists t_test; create table t_test ( dates date, num int ); insert into t_test values('2022-02-01', 10), ('2022-02-10', 20); How to get this data with sql? date_add('2022-02-01', interval 30 day) =…