Updating data in sql
Simply follow the INSERT statement with a query that returns the desired rows.If you want to copy all rows from the source table, exclude the WHERE clause from the query.SQL even has a way, a relatively new addition to the standard, by which you can insert, update, and delete all at once. For example, you want to insert a new record into the DEPT table.That may not sound like too useful a thing now, but the MERGE statement represents a very powerful way to bring a database table into sync with an external source of data (such as a flat file feed from a remote system). The value for DEPTNO should be 50, DNAME should be “PROGRAMMING”, and LOC should be “BALTIMORE”. The SELECT clause displays the table before the updates. The FROM clause specifies EMPLOYEES as the table to select from. The UPDATE statement updates the values in EMPLOYEES.The SET clause specifies that the data in the Salary column be multiplied by 1.04 when the job code ends with a 1 and 1.025 for all other job codes.import pyodbc conn = pyodbc.connect('Driver=;' 'Server=server_name;' 'Database=db_name;' 'Trusted_Connection=yes;') cursor = conn.cursor() cursor.execute('SELECT * FROM db_name.Table') for row in cursor: print(row) You may refer to the following guide that explains the full steps to connect Python to SQL Server using the pyodbc package.
For tables with a mix of default and non-default columns, inserting default values for a column is as easy as excluding the column from the insert list; you do not need to use the DEFAULT keyword.For example, you want to copy rows from the DEPT table to the DEPT_EAST table.The DEPT_EAST table has already been created with the same structure (same columns and data types) as DEPT and is currently empty.This is the template that you can apply in Python to update the records:import pyodbc conn=pyodbc.connect('Driver=;' 'Server=RON\SQLEXPRESS;' 'Database=Test DB;' 'Trusted_Connection=yes;') cursor = conn.cursor() cursor.execute('SELECT * FROM Test Person SET Age = 29, City = 'Montreal' WHERE Name = 'Jon' ''') conn.commit() Don’t forget to add conn.commit() at the end of the code, to ensure that the changes would get implemented.For this final step, you may want to check that the record got updated in SQL Server.