BigQuery UPDATE statement
updates existing rows within a table
UPDATE statement example
\nUPDATE dataset.Inventory\nSET quantity = 100\nWHERE product = 'washer'\n
Syntax reference
UPDATE target_name [[AS] alias]\nSET set_clause\n[FROM from_clause]\nWHERE condition\n\nset_clause ::= update_item[, ...]\n\nupdate_item ::= column_name = expression