Example of writing SQL instead of cursor

Update Tb_Garden1 G Set Steward = (
Select Id From Zyq.Tb_ User u where replace (u.name, 'zone') = g.name and rownum = 1)
Where exists (select 1 from ZYQ. Tb_user u where replace (u.name, 'zone') = g.name and rownum = 1)

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