ddl

There can be only one auto column

My MySQL says “Incorrect table definition; there can be only one auto column and it must be defined as a key” So when I added primary key as below it started working:

How do I use CREATE OR REPLACE?

This works on functions, procedures, packages, types, synonyms, trigger and views. Update: After updating the post for the third time, I’ll reformulate this: This does not work on tables 🙂 And yes, there is documentation on this syntax, and there are no REPLACE option for CREATE TABLE.

PostgreSQL create table if not exists

This feature has been implemented in Postgres 9.1: For older versions, here is a function to work around it: Call: Notes The columns schemaname and tablename in pg_tables are case-sensitive. If you double-quote identifiers in the CREATE TABLE statement, you need to use the exact same spelling. If you don’t, you need to use lower-case strings. See: Are PostgreSQL column names case-sensitive? pg_tables only contains actual tables. The … Read more

How does spring.jpa.hibernate.ddl-auto property exactly work in Spring?

For the record, the spring.jpa.hibernate.ddl-auto property is Spring Data JPA specific and is their way to specify a value that will eventually be passed to Hibernate under the property it knows, hibernate.hbm2ddl.auto. The values create, create-drop, validate, and update basically influence how the schema tool management will manipulate the database schema at startup. For example, the update operation will query the JDBC driver’s API to … Read more

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