I would like to run a conditional select query on a table of sewer structures (S_Structures) in SQLite. The table contains the following columns: struct_type (structure type) and Year (construction year).
The selection will be based on the structure type as well as structure age, I think I've sorted out the type selection bit and with regards to the age, I intend to deduct the year from the local time. This is all fine and well, but how do I go about defining a logical operator as sub query for the specified age range of: 2 < age <= 5.
Select [Year],[Struc_Type]
FROM [S_Structures]
WHERE [Struc_Type] NOT IN
("Manhole", "Rodding Eye", "Dummy",
"End Manhole", "T-Piece", "Sub- Catchment", "Top End");
AND WHERE (strftime('%Y','now') - Year) > '2'
AND (strftime('%Y','now') - Year); <= '5';
A subquery would involve an additional SELECT in parentheses.
Only a single WHERE clause is allowed.
Just use the BETWEEN operator:
SELECT [Year], [Struc_Type]
FROM [S_Structures]
WHERE [Struc_Type] NOT IN ('Manhole', 'Rodding Eye', 'Dummy', 'End Manhole',
'T-Piece', 'Sub-Catchment', 'Top End')
AND (strftime('%Y','now') - Year) BETWEEN 3 AND 5;
Related
I'm trying to replace a placeholder string inside a selection of 10 random records with a random string (a name) taken from another table, using only sqlite statements.
i've done a subquery in order to replace() of the placeholder with the results of a subquery. I thought that each subquery loaded a random name from the names table, but i've found that it's not the case and each placeholder is replaced with the same string.
select id, (replace (snippet, "%NAME%", (select
name from names
where gender = "male"
) )
) as snippet
from imagedata
where timestamp is not NULL
order by random()
limit 10
I was expecting for each row of the SELECT to have different random replacement every time the subquery is invoked.
hello i'm %NAME% and this is my house
This is the car of %NAME%, let me know what you think
instead each row has the same kind of replacement:
hello i'm david and this is my house
This is the car of david, let me know what you think
and so on...
I'm not sure it can be done inside sqlite or if i have to do it in php over two different database queries.
Thanks in advance!
Seems that random() in the subquery is only evaluated once.
Try this:
select
i.id,
replace(i.snippet, '%NAME%', n.name) snippet
from (
select
id,
snippet,
abs(random()) % (select count(*) from names where gender = 'male') + 1 num
from imagedata
where timestamp is not NULL
order by random() limit 10
) i inner join (
select
n.name,
(select count(*) from names where name < n.name and gender = 'male') + 1 num
from names n
where gender = 'male'
) n on n.num = i.num
I want to sort semicolon separated values per row in a column. Eg.
Input:
abc;pqr;def;mno
xyz;pqr;abc
abc
xyz;jkl
Output:
abc;def;mno;pqr
abc;pqr;xyz
abc
jkl;xyz
Can anyone help?
Perhaps something like this. Breaking it down:
First we need to break up the strings into their component tokens, and then reassemble them, using LISTAGG(), while ordering them alphabetically.
There are many ways to break up a symbol-separated string. Here I demonstrate the use of a hierarchical query. It requires that the input strings be uniquely distinguished from each other. Since the exact same semicolon-separated string may appear more than once, and since there is no info from the OP about any other unique column in the table, I create a unique identifier (using ROW_NUMBER()) in the most deeply nested subquery. Then I run the hierarchical query to break up the inputs and then reassemble them in the outermost SELECT.
with
test_data as (
select 'abc;pqr;def;mno' as str from dual union all
select 'xyz;pqr;abc' from dual union all
select 'abc' from dual union all
select 'xyz;jkl' from dual
)
-- End of test data (not part of the solution!)
-- SQL query begins BELOW THIS LINE.
select str,
listagg(token, ';') within group (order by token) as sorted_str
from (
select rn, str,
regexp_substr(str, '([^;]*)(;|$)', 1, level, null, 1) as token
from (
select str, row_number() over (order by null) as rn
from test_data
)
connect by level <= length(str) - length(replace(str, ';')) + 1
and prior rn = rn
and prior sys_guid() is not null
)
group by rn, str
;
STR SORTED_STR
--------------- ---------------
abc;pqr;def;mno abc;def;mno;pqr
xyz;pqr;abc abc;pqr;xyz
abc abc
xyz;jkl jkl;xyz
4 rows selected.
I would like to utilize the Month Column in the below syntax in a Case Statement. When I create a sub query I receive the Oracle error 01788 Connect By Clause Required in query block. How can one utilize the Month column in the case statment in the subquery?
TO_CHAR(ADD_MONTHS(TRUNC(StartDate, 'MM'), LEVEL - 1), 'YYYYMM') AS Month
Query below:
SELECT
CASE
WHEN first_assgn_dt_YYYYMM <= Month
THEN 0
WHEN EndDate < LAST_DAY(EndDate) AND EndDate != sysdate
AND LEVEL = 1 + MONTHS_BETWEEN(TRUNC(EndDate,'MM'),TRUNC(StartDate,'MM'))
THEN 0
ELSE 1
END AS active_at_month_end
FROM (
WITH
ActiveMemberData (ID,StartDate,EndDate,first_assgn_dt,first_assgn_dt_YYYYMM) AS (
SELECT DISTINCT
x.ID,
TRUNC(x.start_dt) AS StartDate,
CASE WHEN TRUNC(X.END_DT) = '1-JAN-3000' THEN SYSDATE ELSE TO_DATE(X.END_DT) END AS EndDate,
x.first_assgn_dt,
TO_CHAR(first_assgn_dt,'YYYYMM') AS first_assgn_dt_YYYYMM
FROM X
LEFT JOIN D ON X.MID = D.ID
WHERE 1=1
)
--------------------------------------------------
SELECT DISTINCT
ID,
first_assgn_dt,
first_assgn_dt_YYYYMM,
StartDate,
TO_CHAR(StartDate,'YYYYMM') AS StartDate_YYYYMM,
EndDate,
TO_CHAR(ADD_MONTHS(TRUNC(StartDate, 'MM'), LEVEL - 1), 'YYYYMM') AS Month,
LAST_DAY(EndDate) AS LastDayOfMonth
FROM ActiveMemberData
WHERE 1=1
------------------------------------------------------------------------------------
CONNECT BY LEVEL <= 1 + MONTHS_BETWEEN(TRUNC(EndDate,'MM'), TRUNC(StartDate,'MM'))
AND PRIOR ID = ID AND PRIOR STARTDATE = STARTDATE
AND PRIOR sys_guid() IS NOT NULL
) Z
WHERE 1=1
ORDER BY
ID,
Month
That has nothing to do with trying to refer to Month from the inline view; that is fine. It's the separate reference to level that is causing the error.
If you want to be able to see the level from your inline view in the outer query, as you are with this line:
AND LEVEL = 1 + MONTHS_BETWEEN(TRUNC(EndDate,'MM'),TRUNC(StartDate,'MM'))
then you have to include it in the select list - with an alias - and then refer to that alias:
SELECT
CASE
...
AND LEVEL_ALIAS = 1 + MONTHS_BETWEEN(TRUNC(EndDate,'MM'),TRUNC(StartDate,'MM'))
...
FROM (
...
SELECT DISTINCT
LEVEL as LEVEL_ALIAS,
ID,
...
You can call the alias whatever you want, of course; you just can't use the reserved word level.
Anything you want visible in the outer query always has to be in the inline view's select list - but usually you can keep the original column name; you have to use an alias for an expression or a pseucocolumn though, which is the case here.
You don't have to use an alias for the reserved word. Just add double quotes and capitilise it i.e. "LEVEL"
SQLITE3
Task: get a data set that contains the following data - SEE NOTES BESIDE COLUMNS
SELECT DISTINCT DateTime(Rounded, 'unixepoch') AS RoundedDate, -- Rounded DateTime to the floor hour
Count() AS Count, -- Count of items that registered within the above time
CAST (avg(Speed) AS INT) AS AverageSpeed, -- Average table.Speed column data within the defined datetime
Count() AS SpeederCount -- ?? WTF? [pseudo constraints: if Speed > Speedlimit then +1]
FROM RawSpeedLane AS sl
INNER JOIN
SpeedLaneSearchData AS slsd ON slsd.ParentId = sl.Id
INNER JOIN
Projects AS p ON p.ProjectId = sl.ProjectId
WHERE sl.ProjectId = 72
GROUP BY RoundedDate;
The SQL above is currently gives me all the data I need, EXECPT for the last column.
This last column is supposed to be the count of records where that pass specific criteria. The only way I have found to successfully do this is to build a sub query... Cool? okay, but the problem is the sub query takes 4 minutes to run because well... I suck at SQL :P No matter how many different ways I've tried to write it, it still takes forever.
Here is the long, but working version.
SELECT DISTINCT RoundedDate,
Count() AS Count,
CAST (avg(Speed) AS INT) AS AverageSpeed,
(
SELECT count()
FROM RawSpeedLane AS slr
WHERE slr.ProjectId = 72 AND
datetime( ( (strftime('%s', Start) - (strftime('%M', Start) * 60 + strftime('%S', Start) ) ) ), 'unixepoch') = sl.RoundedDate AND
Speed > p.SpeedLimit
)
AS SpeederCount
FROM SpeedLaneReportDataView AS sl
INNER JOIN
Projects AS p ON p.ProjectId = sl.ProjectId
WHERE sl.ProjectId = 72
GROUP BY RoundedDate;
I currently just tried this for the last column
(select Count() where sl.Speed > p.SpeedLimit)
but as expected, i got 1s and 0s im not really sure on what to do here. Any hints or help that lead me in the right direction is very much appreciated.
I don't think SQLite has an IIF but CASE works.
This is a response to Backs answer, but I can't comment yet.
SELECT DISTINCT DateTime(Rounded, 'unixepoch') AS RoundedDate, -- Rounded DateTime to the floor hour
Count() AS Count, -- Count of items that registered within the above time
CAST (avg(Speed) AS INT) AS AverageSpeed, -- Average table.Speed column data within the defined datetime
SUM(CASE WHEN Speed > SpeedLimit THEN 1 ELSE 0 END) AS SpeederCount
FROM RawSpeedLane AS sl
With SUM and IIF:
SELECT DISTINCT DateTime(Rounded, 'unixepoch') AS RoundedDate, -- Rounded DateTime to the floor hour
Count() AS Count, -- Count of items that registered within the above time
CAST (avg(Speed) AS INT) AS AverageSpeed, -- Average table.Speed column data within the defined datetime
SUM(IIF(Speed > SpeedLimit, 1, 0)) AS SpeederCount
FROM RawSpeedLane AS sl
example: SELECT title,ROW_NUM FROM article ORDER BY count_read.
What should ROW_NUM be replace by ?
I don't like to after getting the results generate the index by program, because I want to insert into a table Rank with the result data by querying the example DQL above.
What I want to achieve maybe like :
"INSERT INTO RANK r (title, index, lastIndex)
SELECT title,ROW_NUM,(SELECT index FROM RANK WHERE id = :id - 1) FROM article ORDER BY count_read"
Thanks in advance..
I think you might use variables, like this:
"
SET #row_num := 1;
INSERT INTO RANK r (title, index, lastIndex)
SELECT title,
(#row_num := #row_num + 1),
(SELECT index FROM RANK WHERE id = :id - 1)
FROM article ORDER BY count_read
"