date类型是Oracle常用的日期型变量,他的时间间隔是秒。两个日期型相减得到是两个时间的间隔,注意单位是“天”。 timestamp是DATE类型的扩展,可以精确到小数秒(fractional_seconds_precision),可以是0 to9,缺省是6。两个timestamp相减的话,不能直接的得到天数,而是得到,多少天,多少小时,多少秒等。
BEGIN_DATETIMESTAMP, END_DATETIMESTAMP,STATUSCHAR(1)NOTNULL, ERROR_MSGVARCHAR(4000), SYNC_DATA_SIZEINTEGER, LANDING_TABLENAMEVARCHAR(32), LANDING_SCHEMAVARCHAR(32),CONSTRAINTPK_T18_SYNC PRIMARYKEY(SYNC_SQL) );COMMENTONTABLEuser.T18_SYNCIS'同步任务表';COMMENTONCOLUMNuser.T18_SYNC.SYNC_SQLIS...
在DB time的统计信息中,sql execute elapsed time 和parse time elapsed 以及DB CPU,这三项常常会占据90%以上的DB time,而其中sql execute elapsed time又应该会在95%以上,值得注意的是DB CPU和sql execute elapsed time是有交集的,因此你会看到在一份AWR报告中有出现DB CPU + sql execute elapsed time超过DB ...
Date format in Oracle can be represented either asliteralsor asnumericvalues. The literal needs to be in a specified format. The format for the date-times can be set using theNLS_DATE_FORMAT,NLS_TIMESTAMP_FORMAT,NLS_TIMESTAMP_TZ_FORMATand theNLS_DATE_LANGUAGEparameters. The table,...
1)当你把一个表中date类型字段的数据移到另一个表的timestamp类型字段中去的时候,可以直接写INSERT SELECT语句, oracle会自动为你做转换的。 2) to_char函数支持date和timestamp,但是trunc却不支持TIMESTAMP数据类型 a。把DATE类型转换成TIMESTAMP类型
select SYS_EXTRACT_UTC(systimestamp) from dual; --结果:10-6月 -21 06.41.59.738669 上午 SYSDATE:取得当前的日期和时间,类型是DATE.它没有参数.但在分布式SQL语句中使用时,SYSDATE返回本地数据库的日期和时间. select to_char(sysdate,'yyyy-mm-dd hh24:mi:ss') from dual; --结果:2021-06-10 02...
All, I’ve been stumped by this: I have a table that holds a timestamp (with local time zone to be exact). It also holds a simple date column, which contains a date-plus-time value. I need to pass the two values to a su…
INTERNAL_DATE_MAX Internal timestamp retrieves from custom type are extracted in the following format: 01-JAN-77 12.00.00.000000 AM. It is impossible to know the exact century that must be used, so by default any year below 49 will be added to 2000 and others to 1900. You can use ...
(timestamptz,text) | 1.0 | sql | Skip due to version | gsql:Oracle_Functions.sql:1035: NOTICE: | function | nanvl(numeric,numeric) | 1.0 | sql | Skip due to version | gsql:Oracle_Functions.sql:1035: NOTICE: | function | regexp_substr(text,text,int4) | 2.0 | sql | Skip due...
On logical standby databases, avoid using SQL statements such asCREATE TABLEtablenameAS SELECT * FROM bar@dblinkas they may fail. When a statement is executed on the logical standby database, it will access the database link at that time. It is not possible to know if the information on ...