1.
Managed SQL Database - Amazon Relational Database Service (RDS) - AWS
https://aws.amazo
.com/rds/

Amazon Relational Database Service (RDS) is a fully managed, open-source cloud database service that allows you to easily operate and scale your relational database of choice, including Amazon Aurora, PostgreSQL, SQL Server, and MySQL.

3.
OLTP Database, MySQL And PostgreSQL Managed Database - Amazon Aurora - AWS
https://aws.amazo
.com/rds/aurora/

Amazon Aurora is a global-scale relational database service built for the cloud with full MySQL and PostgreSQL compatibility.

4.
Managed PostgreSQL service | Aiven
https://aive
.io/postgresql/

Aiven for PostgreSQL – Managed Postgres database service with Postgres extensions, database forking, connection pooling.

5.
Azure SQL Database – Managed Cloud Database Service | Microsoft Azure
https://azure.microsof
.com/en-us/products/azure-sql/database/

Build apps faster and scale automatically on Azure SQL Database, the intelligent, fully managed relational cloud database.

9.
BigQuery enterprise data warehouse | Google Cloud
https://cloud.googl
.com/bigquery/

BigQuery is a serverless, cost-effective, and multicloud data warehouse designed to help you turn big data into valuable business insights. Start free.