\begin{sql}
UPDATE Organization\_ObjTab \\
SET has\_hq\_in = \\
\>(\>SELECT {\red REF}({\blue cty}) \\
\>\>   FROM ORCity {\blue cty} \\
\>\>   WHERE Name = 'Brussels' \\
\>\>   ~~AND Province = 'Brabant' \\
\>\>   ~~AND Country = 'B') \\
WHERE Abbrev = 'EU';\end{sql}
