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我是 SQL 新手,几乎不需要帮助就能理解此 SQL 语句中的部分
select BUY_VALUE,
SELL_VALUE,
RATE_DAY,
RATE_TIME
from ( SELECT TRIM (b.ticker),
TRIM (TO_CHAR (b.buy_value, '9999999.99')) BUY_VALUE,
TRIM (TO_CHAR (b.sell_value, '9999999.99')) SELL_VALUE,
b.currency,
TO_CHAR (TRUNC (SYSDATE), 'YYYYMMDD') rate_day,
TO_CHAR (SYSDATE, 'HH24MISS') rate_time
FROM portal.gpb_bank_quotes b
WHERE b.ticker = 'GAZP'
)
b
(b.buy_value) 是什么?FROM portal.gpb_bank_quotes
- 那是表名吗?有没有可能是用分隔的。
- 啊啊太难了///
提前致谢