sql - converting a column to be empty -

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I have two tables in which the date of a table is the date and not the other, I have entries from both the table of the main union To bring

So now I have been successful, but the empty area is showing an invalid date like 1901-01-01, I want it to be canceled in an empty form, Like an artist in varchar

I'm trying it like this < P> Throwing the above error

And by doing so it will affect performance


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