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You’ll get a type error without the each, because you need to create a scalar from each vector (i.e. each pair of symbols)
q)t:([]sym:`ORCL`APPL;src:`L`R) t sym src -------- ORCL L APPL R q) update symsrc:` sv (sym,'src) from t 'type [0] update symsrc:` sv (sym,'src) from t ^ q) update symsrc:` sv'(sym,'src) from t sym src symsrc --------------- ORCL L ORCL.L APPL R APPL.R
Bonus tip – as shown above, you can avoid using a lambda by using parenthesis so the parser doesn’t interpret the comma as a new column statement.