Updating a table from another table in sql server consolidating student loans advice sallie mae
If you manage to copy the database objects such as the indexes and constraints, you need to generate script for it individually, after that you need to apply the scripts to the destination database.In our example, to copy the The columns in destination tables are created in the order specified in the select statement.From the data side, most of these tools need extra steps from your side to handle the Identity insert.Using the combination of the Apex SQL Diff and Apex SQL Data Diff or using Apex SQL Script, by a few numbers of simple steps, you will have a complete script for the database tables’ schema and data with no extra effort from your side to handle anything.In some cases, as a DBA, you are requested to copy the schema and the content of specific tables from a database to another one in the same instance or in a different SQL instance, such as copying specific tables from a production database to a DEV one for testing or troubleshooting purposes.
Apex SQL Script is a very useful tool that can be used to copy SQL Server database tables from the source database to the destination one without any effort from your side to handle the tables’ creation order.
But since the UPDATE has no WHERE clause, it will update all rows, even those where the subquery returns NULL.
Consequently, to prevent this, you might do this: One potential issue may arise when the subquery actually finds more than one matching row in tbl B.
Just run these scripts on the destination database and enjoy the result.
Ahmad Yaseen is a SQL Server database administration leader at Aramex International Company with a bachelor’s degree in computer engineering as well as . He is a Microsoft Certified Professional with a good experience in SQL server development, administration, performance tuning, monitoring and high availability and disaster recovery technologies.