如何在 Postgres sql 脚本中执行动态 SQL 语句

Question

Below is my script. I used Execute command to run the dynamic sql statement that i created but it doesn't run and give an output. It doesn't give an error either. How can I run this sql statement inside postgres sql script?

DO $$
DECLARE sqlCommand varchar(1000);
 columnList varchar(75);

BEGIN
select  '"BRANCH_NAME", "ADDRESS1"' into columnList;

select concat('SELECT ' , columnList , ' FROM "TESTSCHEMA"."BRANCH" ')  into sqlCommand;

raise info 'COMMAND %', sqlCommand;
execute sqlCommand;

END $$;

Answer 1

Your example is safe, but if you are dealing with user input, always use the format function to construct the SQL string.

Anyway, your problem is that the EXECUTE statement has no INTO clause with a destination for the query results, si they are simply discarded.