I need help writing a stored procedure

Question

How do I update several tables with columns that store social security number as a single transaction? I have over 70 tables to update the ssn with correct ssn.The database I'm working on is not normalized.
The update is strictly by request. Occasionally, I get calls for a customer who entered their ssn wrongly the first time they registered on the our website. when I get such a request, I manually update all the ssn in every database table that stores information
about the customer. A very tedious task to update over 70 tables with ssn columns one by one. Does anyone have an idea how to do this efficiently ?Can someone show me how write a stored procedure that I can pass in the old SSN and the new SSN then it updates
the 70 tables accordingly?
Does anyone have a blue print that demonstrates how to write the stored procedure?
TableName ColumnName
table1 colA
table2 colB
table3 colC
table4 cold
I query the INFORMATION_SCHEMA.COLUMNS view
to retrieve all the tables that have ssn columns as shown above.

Answer 1

You can create a procedure that receives a ssn parameter and a key value to be searched for in every table, and then a varchar(max) variable that would store a dynamically generated SQL command based on the parameter values and the tables with the ssn column.
Example:
-- THE FOLLOWING VARIABLES ARE PARAMETERS
DECLARE @SSN VARCHAR(100) = '12354676'
DECLARE @PREDICATE VARCHAR(100) = 'A'
DECLARE @CMD VARCHAR(MAX) = '' -- THIS IS THE COMMAND VARIABLE
-- THIS WILL BUILD A SCRIPT TO UPDATE ALL TABLES WHICH CONTAIN THE SSN COLUMN
SELECT @CMD = @CMD + 'UPDATE ' + T.NAME + ' SET SSN = ''' + @SSN + ''' WHERE KEY_COLUMN = ''' + @PREDICATE + '''
GO
FROM SYS.TABLES T
WHERE T.OBJECT_ID IN (SELECT OBJECT_ID FROM SYS.COLUMNS WHERE NAME = 'SSN')
EXEC (@CMD);
Just because there are clouds in the sky it doesn't mean it isn't blue. But someone will come and argue that in addition to clouds, birds, airplanes, pollution, sunsets, daltonism and nuclear bombs, all adding different colours to the sky, this
is an undocumented behavior and should not be relied upon.