list schema tables then display selected table data

You can use the following query to select and display the table names of the database

-- This is for SQL Server Database
SELECT *
FROM information_schema.tables
WHERE table_type = 'BASE TABLE'

Once you get the lists of table you can pass the selected table name to the following query to get the list of records.

SELECT *
FROM TableName -- TableName will be one of the tables from the list. E.g Customers

The delete and update commands are a little bit tricky. You may need to know the primary key of the table.However the update also depends on which columns are going to be updated.
Here is how to list only the primary key columns of the table.

Exec sp_primarykey TableName -- TableName will be one of the tables from the list. E.g Customers

Here is how to list all columns of the table.

SELECT 
* FROM sys.columns WHERE object_id = OBJECT_ID(TableName) -- TableName will be one of the tables from the list. E.g Customers

Once you get the list of primary key and the rest of columns you will build your where statement string
For Delete Delete SQL Statement[^]

DELETE 
FROM TableName 
WHERE Criteria -- Criteria depends of the primary key and the corresponding records E.g pk1='1' AND pk2='2'

For Update Update SQL Statement[^]

UPDATE TableName
SET ColumnsList -- Columnslist with corresponding list values col1='1' ,col2='2' ...
WHERE Criteria -- Criteria depends of the primary key and the corresponding selected record E.g pk1='1' AND pk2='2'

This is basically what you need to do. There may be little additional work and tune ups.