I've got a table defined like this:
CREATE TABLE event (t REAL, event TEXT, value);
For each record in the table which have event='type' and value='G' there will be two corresponding records with event='Z' - one with value=1 and one with value=0. Here is an example:
t | event | value
1624838448.123 | type | G
1624838448.123 | Z | 1
1624839543.215 | Z | 0
Note that there could be other event='Z' records that don't have corresponding type='G' records. I'm trying to write a query to find all the event='G' records that do have a corresponding type='G' record to use as the bounds for an additional query (or join?).
Note: The t value for the "type" event and the Z event where value=1 will always be the same.
So for instance if the table looked like this:
t | event | value
1624838448.123 | type | G
1624838448.123 | Z | 1
1624839543.215 | Z | 0
1624839555.555 | type | H
1624838555.555 | Z | 1
1624839602.487 | Z | 0
1624839999.385 | type | G
1624839999.385 | Z | 1
1624840141.006 | Z | 0
Then I want the results of the query to return this:
t1 | t2
1624838448.123 | 1624839543.215
1624839999.385 | 1624840141.006
From your comment:
There are always three records (ignoring any other events in between)
in chronological order: the "type" event, the first "Z" record with
the same timestamp, and the second "Z" record with a later timestamp
So, there is no need to return t1 separately since it is equal to t in the row where event = 'type' and value = 'G'.
For t2 you can use conditional aggregation with MIN() window function:
SELECT t1, t2
FROM (
SELECT t AS t1, event, value
MIN(CASE WHEN event = 'Z' AND value = '0' THEN t END) OVER (ORDER BY t ROWS BETWEEN 1 FOLLOWING AND UNBOUNDED FOLLOWING) t2
FROM Event
)
WHERE event = 'type' AND value = 'G'
See the demo.
I found a solution using the RANK() function. With this I get an intermediate table which has the same rank for both the "type" and first "Z" record, since they have the same timestamp, and a rank two greater for the second "Z" record. I use WITH so I can self join repeatedly without having to specify the same query over and over. I first join the "type" and first "Z" row by requiring that the type of two second record be greater than that of the first (so I only get the type:Z combination and not type:type, Z:type, or Z:Z). Then I self join again to get the rank-2 row which picks up the second Z record. Overall, the query looks like this:
WITH Seq(t,event,A,I)
AS
(
SELECT t, event, value,
RANK() OVER (ORDER BY t) I
FROM Event e1
WHERE (e1.event='type' OR e1.event='Z')
)
SELECT s2.t,s3.t
FROM Seq s1
INNER JOIN Seq s2 ON s1.I = s2.I AND s1.event < s2.event
INNER JOIN Seq s3 ON s1.I = s3.I-2
WHERE s1.value='G';
Lets say I have a query like:
cluster("cluster1").database("db2").Table3
| distinct * // distinct combinations of data
| take 5 // take 5
How do I save the values from a column in the results output to a pack_array variable.
I want to use this pack_array variable for follow on queries like:
cluster("cluster2").database("db3").Table1
| where ColumnofInterest in (pack_array_var from above)
| take 5 // take 5
Provide the "*" argument to the function and use the "let" statement. Here is an example:
let ValuesFromTheOtherCluster = cluster('cluster1').database('db2').Table3
| extend tempArray = pack_array(*)
| summarize filters = make_set(tempArray);
cluster('cluster2').database("db3").Table1
| where ColumnofInterest in (ValuesFromTheOtherCluster)
I need help creating a single SELECT statement as part of a CREAT VIEW statement that contains multiple, separate filtering or grouping requirements.
I am working on an SQLite database to track usage of our local food pantry, where we have two types of visitors, “Scheduled” or “Drop-In”, visiting on different days. One of the central tables is the “visit_log” table that tracks each visit by date, time, type of visit, and people in the household.
I’m trying to create a VIEW that summarizes that “visit_log” grouped by the visit_date, and for both number of records and SUM of household size, displaying the number of “Drop-Ins”, the number of “Scheduled” and the total of the two types.
Here is the “visit_log”
CREATE TABLE "visit_log" ("visit_date" DATE, "visit_time" TIME, "client_relation" TEXT, "household_size" INTEGER)
Here is a sample of the “visit_log” table’s content. (We have not started recording the visit_time yet, so those values are blank).
"visit_date","visit_time","client_relation","household_size"
"6/9/20","","Scheduled","1"
"6/9/20","","Scheduled","1"
"6/9/20","","Drop-In","2"
"6/9/20","","Drop-In","3"
"6/9/20","","Drop-In","8"
"6/9/20","","Drop-In","5"
"6/16/2020","","Scheduled","1"
"6/16/2020","","Scheduled","1"
"6/16/2020","","Drop-In","4"
"6/16/2020","","Drop-In","5"
"6/16/2020","","Drop-In","2"
"6/16/2020","","Drop-In","2"
"6/16/2020","","Drop-In","5"
"6/16/2020","","Drop-In","1"
I can create three separate VIEW, one for each type and one for the two combined. But my goal is to have the results of these three VIEWs in one.
Here are the three VIEWs. First is for the two client types combined.
CREATE VIEW "visit_summary" AS SELECT
visit_date,
COUNT (*) AS households_total,
SUM (household_size) AS individuals_total
FROM
"visit_log"
GROUP By visit_date
This yields
"visit_date","households_total","individuals_total"
"06/09/2020","12","44"
"06/16/2020","8","21"
"06/23/2020","7","20"
"06/30/2020","10","22"
"07/07/2020","7","18"
Next is the VIEW for the Drop-Ins
CREATE VIEW "visit_summary_dropin" AS SELECT
visit_date,
COUNT (*) AS households_dropin,
SUM (household_size) AS individuals_dropin
FROM
"visit_log"
WHERE client_relation = "Drop-In"
GROUP By visit_date
This yields
"visit_date","households_dropin","individuals_dropin"
"06/09/2020","10","42"
"06/16/2020","6","19"
"06/23/2020","4","13"
"06/30/2020","6","12"
"07/07/2020","6","16"
Finally is the VIEW for the Scheduled
CREATE VIEW "visit_summary_scheduled" AS SELECT
visit_date,
COUNT (*) AS households_schedualed,
SUM (household_size) AS individuals_scheduled
FROM
"visit_log"
WHERE client_relation = "Scheduled"
GROUP By visit_date
This yields
"visit_date","households_schedualed","individuals_scheduled"
"06/09/2020","2","2"
"06/16/2020","2","2"
"06/23/2020","3","7"
"06/30/2020","4","10"
"07/07/2020","1","2"
What I'm hoping to create is a single VIEW that yields
"visit_date","households_total","individuals_total","households_dropin","individuals_dropin","households_schedualed","individuals_scheduled"
"06/09/2020","12","44","10","42","2","2"
etc…
So my ultimate question, finally, is how to create a single VIEW containing something like multiple WHERE classes to define different columns?
You can do it with conditional aggregation:
CREATE VIEW visit_summary_scheduled_all AS
SELECT visit_date,
COUNT(*) households_total,
SUM(household_size) individuals_total,
SUM(client_relation = 'Drop-In') households_dropin,
SUM(CASE WHEN client_relation = 'Drop-In' THEN household_size END) individuals_dropin,
SUM(client_relation = 'Scheduled') households_scheduled,
SUM(CASE WHEN client_relation = 'Scheduled' THEN household_size END) individuals_scheduled
FROM visit_log
GROUP By visit_date
See the demo.
Results:
| visit_date | households_total | individuals_total | households_dropin | individuals_dropin | households_scheduled | individuals_scheduled |
| ---------- | ---------------- | ----------------- | ----------------- | ------------------ | -------------------- | --------------------- |
| 6/16/2020 | 8 | 21 | 6 | 19 | 2 | 2 |
| 6/9/20 | 6 | 20 | 4 | 18 | 2 | 2 |
I have a gridview and I was able to highlight a cell based on field name and criteria of cell in that column. Now I want to do the same thing but also consider the row value from the second column as well. Example below
Gender | Part Number | Small | Medium | Large
Men | C-888-TVN | 5 | 6 | 9
Men | C-777-TV4 | 7 | 7 | 8
So if I want to highlight the '7' in the C-777-TV4 row and under the Medium size how would I go about doing both criteria. This is not based on a number value criteria just the name of the header "Medium" and string value in the part number row "C-777-TV4".
Here is the new code that i'm getting an out of range error:
Protected Sub gridStock_HtmlRowPrepared(sender As Object, e As ASPxGridViewTableRowEventArgs) Handles gridStock.HtmlRowPrepared
If e.RowType <> GridViewRowType.Data Then
Return
End If
Dim name As String = e.GetValue("CorePN").ToString()
If name = "777-M-MBL" Then
e.Row.Cells(10).BackColor = System.Drawing.Color.Red
End If
End Sub
Getting the error at e.Row.Cells(10).Backcolor
I need to see more code of yours. Here is what I thought:
If row.Cell(1).Text = "C-777-TV4" Then
e.Row.Cells(5).BackColor = System.Drawing.Color.Cyan
End If
I have a table with this structure:
id | IDs | Name | Type
1 | 10 | A | 1
2 | 11 | B | 1
3 | 12 | C | 2
4 | 13 | D | 3
except id nothing else is a FOREIGN or PRIMARY KEY. I want to select a row based on it's column values that are not PRIMARY KEY. I have tried the following syntax but it yields no results.
SELECT * FROM MyTable WHERE Name = 'A', Type = 1;
what am I doing wrong? What is exactly returned by a SELECT statement? I'm totally new to Data Base and I'm currently experimenting and trying to learn it. so far my search has not yield any results regarding this case.
Use and to add multiple conditions to your query
SELECT *
FROM MyTable
WHERE Name = 'A'
AND Type = 1;