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update table1<br />
set field1 = 'whatever' where field1 is null<br />
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only writes into blank field1
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How do we update a column in SQL database without overwriting the existing data?
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How do we update a column in SQL database without overwriting the existing data?

update table1
set field1 = &amp;#39;whatever&amp;#39; where field1 is null

only writes into blank field1

Sql query to update a column without overwriting the existing data.

Microsoft SQL Server is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.SQL Server is available in multiple versions, typically identified by release year, and versions are subdivided into editions to distinguish between product functionality. Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning.

Microsoft SQL Server

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.