https://www.drupal.org/docs/7/guidelines-for-sql/writing-code-compliant-with-both-mysql-and-postgresql/postgresqlism-concat
PostgreSQLism: CONCAT() can only take two arguments (D6 only, fixed in D7) | Writing code compliant...
Sep 8, 2016 - The CONCAT() is supported on both MySQL and Postgresql, but only with two parameters. Where you could write (in MySQL):
https://www.drupal.org/docs/7/guidelines-for-sql/writing-code-compliant-with-both-mysql-and-postgresql/postgresqlism-avoid
PostgreSQLism: avoid mutiple ROW inserts (PostgreSQL 8.2 only) | Writing code compliant with both...
Sep 8, 2016 - PostgreSQL 8.2, 83 and 8.4 are not affected by this issue.
https://www.drupal.org/docs/7/guidelines-for-sql/writing-code-compliant-with-both-mysql-and-postgresql/mysqlism-and
MySQLism and PostgreSQLism: avoid deleting data in several tables in one query | Writing code...
Sep 8, 2016 - SQL-99 does not allow to delete data in several tables in one query. The reasons for this are quite obscure. Maybe that it was considered