As-Of Price Join for Trade Valuation

SQL practice question · Hard · Joins · Goldman Sachs, JPMorgan

Prices are missing on holidays. Value every trade with the most recent close_price of the same ticker on or before the trade_date (an 'as-of' join). If no earlier price exists, price_used and trade_value are NULL. trade_value = qty * price_used (qty is negative for sells), ROUND 2. Return trade_id, ticker, trade_date, price_used, trade_value. Order by trade_id.

Table: trades

Schema of trades
ColumnType
trade_idINTEGER
tickerTEXT
trade_dateDATE
qtyINTEGER
Sample rows of trades
trade_idtickertrade_dateqty
1ALPHA2026-03-0310
2ALPHA2026-03-05-5
3BETA2026-03-0320
4BETA2026-03-074
5ALPHA2026-03-062

Table: prices

Schema of prices
ColumnType
tickerTEXT
price_dateDATE
close_priceREAL
Sample rows of prices
tickerprice_dateclose_price
ALPHA2026-03-02100
ALPHA2026-03-03102
ALPHA2026-03-06105
BETA2026-03-0250
BETA2026-03-0452
Expected output on the sample data
trade_idtickertrade_dateprice_usedtrade_value
1ALPHA2026-03-031021020
2ALPHA2026-03-05102-510
3BETA2026-03-03501000
4BETA2026-03-0752208
5ALPHA2026-03-06105210

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