在Oracle中,可以使用TO_TIMESTAMP函數(shù)將日期字符串轉(zhuǎn)換為timestamp類型,然后進(jìn)行比較。以下是一些常用的Oracle timestamp比較技巧:
SELECT *
FROM table_name
WHERE timestamp_column1 > timestamp_column2;
SELECT *
FROM table_name
WHERE timestamp_column > CURRENT_TIMESTAMP;
SELECT *
FROM table_name
WHERE timestamp_column > TO_TIMESTAMP('2022-01-01 00:00:00', 'YYYY-MM-DD HH24:MI:SS');
SELECT *
FROM table_name
WHERE timestamp_column BETWEEN TO_TIMESTAMP('2022-01-01 00:00:00', 'YYYY-MM-DD HH24:MI:SS')
AND TO_TIMESTAMP('2022-12-31 23:59:59', 'YYYY-MM-DD HH24:MI:SS');
SELECT *
FROM table_name
WHERE EXTRACT(HOUR FROM timestamp_column) BETWEEN 9 AND 17;
SELECT *
FROM table_name
WHERE TO_CHAR(timestamp_column, 'D') BETWEEN 2 AND 6; -- 1為星期日,2為星期一,以此類推
以上是一些常用的Oracle timestamp比較技巧,希望對(duì)你有幫助。如果有其他問(wèn)題,請(qǐng)隨時(shí)提問(wèn)。