如何为以下 Postgres 索引创建语句创建 Liquibase 变更集 - 在索引中连接 2 列

Question

create index if not exists employee_index 
   on employee(emp_id, (emp_first_name|| ' ' ||emp_last_name));

I'm able to use the above statement in Postgres, I want to have it in my Liquibase changeset. I need to combine the first and last names as above in the index since it gives better performance. I was told that I can't deviate from it.

Answer 1

You can create an expression based index by enclosing the expression in parentheses:

<createIndex tableName="employee" indexName="employee_index">
  <column name="emp_id"/>
  <column name="(emp_first_name||' '||emp_last_name)"/>
</createIndex>