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For more information, see CAST and CONVERT (Transact-SQL).Reducing the precision or scale of a column may cause data truncation.The modified column cannot be any one of the following: Some data type changes may cause a change in the data.For example, changing an nchar or nvarchar column to char or varchar may cause the conversion of extended characters.If the table is not in the current database or is not contained by the schema owned by the current user, the database and schema must be explicitly specified.
Also, they are using different dialects, such as − When you are executing an SQL command for any RDBMS, the system determines the best way to carry out your request and SQL engine figures out how to interpret the task.
The data type of columns included in an index cannot be changed unless the column is a varchar, nvarchar, or varbinary data type, and the new size is equal to or larger than the old size.
A columns included in a primary key constraint, cannot be changed from NOT NULL to NULL.
However, Sphinx does not depend on nor require any specific database to function.
Applications can access Sphinx search daemon (searchd) using any of the three different access methods: a) via Sphinx own implementation of My SQL network protocol (using a small SQL subset called Sphinx QL, this is recommended way), b) via native search API (Sphinx API) or c) via My SQL server with a pluggable storage engine (Sphinx SE).