SQLServer modify the database field type

 

 

# Modify the field name to a temporary field exec sp_rename ' data_config.description ' , description1, ' COLUMN ' ;
 
# Create a new field and set it to the target format 
alter  table data_config add description text   ; 
# Save the value in the temporary field to the new field
 update data_config set description = description1; 
# delete temporary field
 alter  table data_config drop  column description1;