Gross SPY call and put gamma against the net, trailing 60 calendar days

SELECT
    toString(d)                                                             AS session_date,
    formatDateTime(d, '%b %e')                                              AS session_label,
    round(sumIf(gex, side = 'call') / 1e9, 2)                               AS call_gex_bn,
    round(-sumIf(gex, side = 'put') / 1e9, 2)                               AS put_gex_bn,
    round((sumIf(gex, side = 'call') - sumIf(gex, side = 'put')) / 1e9, 2)  AS net_gex_bn
FROM
(
    SELECT
        date                                                   AS d,
        if(lower(option_type) LIKE 'c%', 'call', 'put')        AS side,
        toFloat64(gamma) * toFloat64(volume) * 100
            * pow(toFloat64(underlying_close), 2) * 0.01       AS gex
    FROM global_markets.options_greeks
    WHERE underlying_symbol = 'SPY'
      AND date >= today() - 60
      AND iv_converged = 1
      AND volume > 0
      AND days_to_expiry BETWEEN 0 AND 45
)
GROUP BY d
ORDER BY d