SQL command line

my friend wants from me to write two queries for him but really I don't know ,would you please help me? also there is a table with two column (String Telephone and BIGIN Charge). the sentences that I want to write a query for that: one: Reduce the “Charge” for all Telephone numbers starting with ‘123’ by 30. two: Update all the Telephone numbers in the table by adding a ‘02’ in front of it. thanks. ** I use MySQL**
What do you have so far? Are you sure this isn't just homework?

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