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並前往https://firebirdsql.org/refdocs/langrefupd21-intfunc-extract.html

EXTRACT()

Available in: DSQL, ESQL, PSQL. Added in: IB 6. Changed in: 2.1 ... WEEKDAY, SMALLINT, 0–6, 0 = Sunday. YEARDAY, SMALLINT, 0–365, 0 = January 1.

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