<div>
rewrite your update into SELECT:<br />
select count(*) from ... where ...
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rewrite your update into SELECT:
select count(*) from ... where ...

<div>
use transaction control and rollback your changes.<br />
begin work;<br />
update xxx...<br />
rollback work;
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use transaction control and rollback your changes.
begin work;
update xxx...
rollback work;

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<div class="content wysiwyg-content">
Is there a way I can simulate an update query so it will tell me a certain of number of rows would be updated but doesn't actually update them?
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</div>


Is there a way I can simulate an update query so it will tell me a certain of number of rows would be updated but doesn't actually update them?

Simulate an update query in Postgres

PostgreSQL is an object-relational database management system with an emphasis on extensibility and standards-compliance. As a database server, its primary function is to store data securely, supporting best practices, and to allow for retrieval at the request of other software applications. PostgreSQL implements the majority of the SQL2011 standard, is ACID-compliant and transactional using multiversion concurrency control (MVCC), and handles complex SQL queries using many indexing methods that are not available in other databases. It is cross-platform and runs on many operating systems including Linux, FreeBSD, OS X, Solaris, and Microsoft Windows.

PostgreSQL

SQL (Structured Query Language) is designed to be used in conjunction with relational database products as of a means of working with sets of data. SQL consists of data definition, data manipulation, and procedural elements. Its scope includes data insert, query, update and delete, schema creation and modification, and data access control.