In the Oracle database, what does the EXTRACT() function do?

1: EXTRACT()is an SQL function used to extract a specific part from a date or time value. Its basic syntax is as follows:

EXTRACT ( field FROM source )

where, fieldspecifies the part to extract sourcefrom and can be one of the following values:

YEAR:years
MONTH:month
DAY:Day
HOUR: hour (24-hour format)
MINUTE:minute
SECOND: seconds

sourceis a date or time value, which can be a column name, expression, or constant.

For example, if you have a datetimecolumn and you want to extract the year in that column, you can use the following query:

SELECT EXTRACT(YEAR FROM datetime) AS year FROM mytable;









SELECT 
DEBUG_EQUIPMENT_TREND AS 调试台设备利用率 ,
SHAKING_EQUIPMENT_TREND AS 震动台设备设备利用率 , 
STICKERS_EQUIPMENT_TREND AS 电装标贴设备利用率,
DEBUG_EQUIPMENT_FAILURERATE AS 调试台故障率,
SHAKING_EQUIPMENT_FAILURERATE AS 震动台故障率,
STICKER_EQUIPMENT_FAILURERATE AS 电装标贴故障率
FROM BRAIN.DM_EQUIPMENTUTILIZATION_TREND
WHERE EXTRACT(YEAR FROM TO_DATE(STAT_TIME, 'YYYYMM')) = '2023'

This returns a new column yearnamed containing datetimethe year portion of each date value in the column.

In the Oracle database, what does the EXTRACT() function do?

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