I was working on my Spring boot app project and noticed that, sometimes there is a connection time out error to my Database on another server(SQL Server). This happens specially when I try to do some script migration with FlyWay but it works after several tries. Then I noticed that I didn’t specify spring.jpa.hibernate.ddl-auto in … Read more
In a MySQL script you can write: CREATE TABLE IF NOT EXISTS foo …; … other stuff … and then you can run the script many times without re-creating the table. How do you do this in PostgreSQL? 6 Answers 6
I would like to give a user all the permissions on a database without making it an admin. The reason why I want to do that is that at the moment DEV and PROD are different DBs on the same cluster so I don’t want a user to be able to change production objects but … Read more
I need to add multiple columns to a table but position the columns after a column called lastname. I have tried this: ALTER TABLE `users` ADD COLUMN ( `count` smallint(6) NOT NULL, `log` varchar(12) NOT NULL, `status` int(10) unsigned NOT NULL ) AFTER `lastname`; I get this error: You have an error in your SQL … Read more
I have heard the terms DDL and DML in reference to databases, but I don’t understand what they are. What are they and how do they relate to SQL? 13 Answers 13
Given the table created using: CREATE TABLE tbl_Country ( CountryId INT NOT NULL AUTO_INCREMENT, IsDeleted bit, PRIMARY KEY (CountryId) ) How can I delete the column IsDeleted? 9 s 9 ALTER TABLE tbl_Country DROP COLUMN IsDeleted; Here’s a working example. Note that the COLUMN keyword is optional, as MySQL will accept just DROP IsDeleted. Also, … Read more
What is the syntax for specifying a primary key on more than 1 column in SQLITE ? 9 s 9 According to the documentation, it’s CREATE TABLE something ( column1, column2, column3, PRIMARY KEY (column1, column2) );
