我有一个field1 timestamp,datatype值格式为2016-02-23 12:01:30.
我正在运行查询:
UPDATE <table> set field1 = '2015-12-31'::timestamp::date where .....
输出变为:
2015-12-31 00:00:00
它将时间转换为全零.如何更改日期并保留时间戳？
在我的课上我有这个参数:
public Long label_id ;
当我尝试评估label_id中的值为0时
if(item.label_id == new Long(0)) {
Doesn't enter here
} else {
Enters here
}
它应该进入条件,因为它们都为零,但它进入了else条件.我甚至试过调试代码:
label_id Long (id=142)
value 0
我在这里错过了什么吗？
如何创建按日期范围分区的索引，我使用的索引在运行时出现错误？
CREATE INDEX "PV_TNPM"."TEJAS_SDH_PM_PDH_IDX2" ON "PV_TNPM"."TEJAS_SDH_PM_PDH" ("DATETIME","NODE_NAME", "NODE_IP", "OBJECT_NAME")
GLOBAL PARTITION BY RANGE(DATETIME) INTERVAL (INTERVAL '15' MINUTE)
(PARTITION INITIAL_PARTITION VALUES LESS THAN (DATE '2014-10-10') );
但出现错误：
Error starting at line : 11 in command -
CREATE INDEX "PV_TNPM"."TEJAS_SDH_PM_PDH_IDX2" ON "PV_TNPM"."TEJAS_SDH_PM_PDH" ("DATETIME","NODE_NAME", "NODE_IP", "OBJECT_NAME")
GLOBAL PARTITION BY RANGE(DATETIME) INTERVAL (INTERVAL '15' MINUTE)
(PARTITION INITIAL_PARTITION VALUES LESS THAN (DATE '2014-10-10') )
Error at Command Line : 12 Column : 37
Error report -
SQL Error: ORA-00906: missing left parenthesis
00906. 00000 - …我是javascript的新手,想知道代码的输出是什么:
var myObject = {
foo: "bar",
func: function() {
var self = this;
console.log("outer func: this.foo = " + this.foo);
console.log("outer func: self.foo = " + self.foo);
(function() {
console.log("inner func: this.foo = " + this.foo);
console.log("inner func: self.foo = " + self.foo);
}());
}
};
不确定foo是如何工作的.
我在json_aggfor中有多个表psql：
SELECT json_agg(t) FROM (SELECT *,
( SELECT row_to_json(b) FROM ( SELECT * from (SELECT *, ( (3959 * acos( cos( radians(6.414478) ) * cos( radians( lat ) ) * cos( radians( lng ) - radians(12.466646) ) + sin( radians(6.414478) ) * sin( radians( lat ) ) ) ) * 1.609344 ) AS distance
from farm_location ) al WHERE farm_location_id=supply_forecast.farm_location_id and distance < 100 ) b) as farm_location,
( SELECT json_agg(c) FROM ( SELECT *
FROM …我通过从我检索的当前日期扣除-5分钟来转换特定日期时间格式:
csvFileDate是一个带格式的日期列表yyyyMMddhhmm.下面是我正在使用的代码,但它将日期转换为错误:
private SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMddhhmm");
private List<String> csvFileDates = new ArrayList<String>();
....
Collections.sort(csvFileDates);
String currDate = csvFileDates.get(csvFileDates.size() -1);
System.out.println("DATE1 " + currDate);
Calendar c = Calendar.getInstance();
c.setTime(dateFormat.parse(currDate));
c.add(Calendar.MINUTE, -5);
System.out.println("DATE2 " + c.getTime());
输出:
DATE1 201505181208
DATE2 Mon May 18 00:03:00 SGT 2015
另一个:
DATE1 201505181213
DATE2 Mon May 18 00:08:00 SGT 2015
知道为什么吗？