我有一个分区/集群表如下:
当我运行这个查询时:
SELECT
projectId
FROM
`projectId.dataset.tables`
WHERE _PARTITIONTIME >= "2019-03-16 00:00:00" AND _PARTITIONTIME <= "2019-03-17 00:00:00"
AND projectId='myproject'
GROUP BY
projectId
limit 1
我看到了对597 MB的实际扫描
但是,当我在前一天运行相同的查询
我正在为我的小咖啡馆在Filemaker (v15)中创建一个库存数据库,我已经制作了一个,所以当我点击那个按钮时,。
它通过运行如下脚本来执行该操作:
Go to Layout [ “Inventory Reorders Required” (Inventory) ]
Enter Find Mode [ Pause: Off ]
Set Field [ Inventory::Availability ; "Reorder Required" ]
Perform Find []
Sort Records [ Restore ; With dialog: Off ]
然后
如何将以下SQL语句转换为LinqToSQL语句?
select field, 1 as ordering from table where field2 = condition1
union all
select field, 7 as ordering from table where field2 = condition2
union all
select field, 3 as ordering from table where field2 = condition3
union all
select field, 2 as ordering from table where fiel
sample = pd.DataFrame({'Cat':['A','B','C','A','B','C','A','B','C'],
'Year':[2001,2002,2003,2001,2002,2003,2001,2002,2003]})
for s in sample.groupby(['Year']):
print s[0]
那会给
2
我在C#上测试线程,但有时我收到一些奇怪的结果,根据逻辑我认为结果是"1","2“或没有,但有时控制台上的结果显示为"12”。C#上有个bug,还是有什么解释?
class Program
{
static int x = 0, y = 0;
static void Main(string[] args)
{
Thread t1, t2;
t1 = new Thread(function1);
t2 = new Thread(function2);
t1.Start();
public ActionResult Index(string sortOrder){
ViewBag.NameSortParm = String.IsNullOrEmpty(sortOrder) ? "name_desc" : "";
ViewBag.DateSortParm = sortOrder == "Date" ? "date_desc" : "Date";
var students = from s in db.Students
select
我正在更新我的公司产品数据库,我正在研究设计我们的分面导航“选择器”表的不同方法。分面导航的想法可能如下所示:
📷
这是分层数据。我一直在读比尔·卡温关于分层数据的不同设计模式的幻灯片。
我在试用“闭包表”的模式。我有两张桌子看起来像这样:
CREATE TABLE Selector (
SelectorID INT NOT NULL PRIMARY KEY AUTO_INCREMENT,
Name VARCHAR(32),
SortOrder INT
);
CREATE TABLE SelectorPath (
AncestorID INT NOT NULL,
D
我使用pgr_astar函数PostgreSQL来得到最优路径,并且我提到了结果应该由seq排序
cur.execute("create table %s as SELECT a.seq, a.id1 AS node, a.id2 AS edge,
b.source, b.target, b.cost, b.reverse_cost, b.km, b.%s, b.%s, b.estimated_time as time, b.ang_elev, b.geom_way
FROM pgr_astar ('SELECT id, source, target, cost as cos