T-SQL | Lightweight Implementation to Enable Built
kandi X-RAY | T-SQL Summary
kandi X-RAY | T-SQL Summary
A Lightweight Implementation to Enable Built-in Temporal Support in MVCC-based RDBMSs
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QUESTION
Based on Measure the time it takes to execute a t-sql query, how would one time several trials of a query in PostgreSQL?
A general outline would be -- set up number of trials (say 1000)
...ANSWER
Answered 2022-Mar-03 at 22:04Coming from an MSSQL background myself and now more often working in Postgres I feel your pain =)
The "trouble" with Postgres is that it supports only 'basic' SQL commands (SELECT, INSERT, UPDATE, CREATE, ALTER, etc...) but the moment you want to add logic (IF THEN, WHILE, variables, etc.) you need to switch to pl/pgsql which you can only use inside functions (AFAIK). From a TSQL POV there are quite some limitations and in fact, some things suddenly don't work anymore (or need to be done differently.. e.g. SELECT * INTO TEMPORARY TABLE tempTable FROM someTable
will not work but CREATE TABLE tempTable AS SELECT * FROM someTable
will)
Something I learned the hard way too is that CURRENT_TIMESTAMP
(or Now()
) will return the same value within a transaction. And since everything inside a function runs inside a transaction this means you have to use clock_timstamp()
Anyway, to answer your question, I think this should get you going:
QUESTION
I have an SSIS data flow that contains a script Component as a source. I'd like to generate the source data by running a script on an SQL Server database. The connection string to be used to connect to the database is set to be sensitive. How can I read this sensitive parameter inside the script component using C#?
In a Script Task, usually it is read for example as the following:
...ANSWER
Answered 2022-Mar-02 at 15:35Despite the lack of a GetSensitiveValue
method existing in the Script Component, I was able to access the value just fine.
What I did fumble with was my Package Protection level and how it interacts with Project Parameters that are marked as Sensitive.
I defined a Project Parameter named MySecretPassword
and populated it with SO_71308161 and marked it as sensitive.
I defined a single column output and my intention was to just push the password into the dataflow to confirm I was able to access it
QUESTION
I am struggling to get this code to work, not sure how to do it in PL/SQL like T-SQL, ive tried both:
...ANSWER
Answered 2022-Feb-17 at 17:34Using Snowflake Scripting:
QUESTION
I am new to Transact-SQL, assume I have a sql table
...ANSWER
Answered 2022-Feb-17 at 14:27You can use a case
statement:
QUESTION
I distinctly recall that T-SQL will never let you mix LAG
and WHERE
. For example,
ANSWER
Answered 2022-Feb-05 at 15:10Having
clause can only be used with Group by
clause. In order to use Group by
the listed columns should be aggregated using Group by
columns. Group by
can only be used with aggregate functions like min,max,sum,count
functions. Hence it is not possible to combine having
clause along with the LAG
analytical function.
In order to use LAG
and Having
, one should use CTE or subquery.
QUESTION
I can not imagine how to fix my problem using t-sql.
- I need MIN(ValidFrom) and MAX(ValidTo) out of a table with different time blocks considering a chronological sequence and a number.
- A normal group won't work because MIN(ValidFrom) and MAX(ValidTo) for num 100 will not be correct.
- I can not imagine how to get the expected results from this table using any analytic or rank function in t-sql.
I need minimum and maximum dates out of the following table.
ValidFrom ValidTo Num ID Number 2019-06-01 2019-12-31 100 01234567 2020-01-01 2020-03-31 100 01234567 2020-04-01 2020-12-31 100 01234567 2021-01-01 2021-01-31 100 01234567 2021-02-01 2021-03-31 50 01234567 2021-04-01 2021-09-30 50 01234567 2021-10-01 2021-12-31 50 01234567 2022-01-01 2022-04-30 100 01234567Expected result of the query:
ValidFrom ValidTo Num ID Number 2019-06-01 2021-01-31 100 01234567 2021-02-01 2021-12-31 50 01234567 2022-01-01 2022-04-30 100 01234567 ...ANSWER
Answered 2022-Jan-25 at 22:43A ranking can be calculated based on 2 ROW_NUMBER
.
Once you have the ranking, it's simple to aggregate.
QUESTION
How can I (or is it possible?) use something like CASE
statement in T-SQL
inside QUERY
in Google spreadsheet?
I want to do something like this:
=QUERY(A6:AI,"select A,(CASE WHEN D>2.5 THEN 'Yes' ELSE 'No' END),E,C,J")
I want basically a custom column with Yes/No values based on other column. Is it possible?
EDIT: To better explain, I have data in table Existing table
and I would like to transform it to the Transformed table
using QUERY
statement:
So I need something to say: if column D is empty, print No, otherwise print Yes. This has to be in the QUERY
because it's not the last column, there will be more data after column Finished
. So I have this:
=QUERY(A4:D,"Select A, B, (CASE WHEN D='' THEN 'No' ELSE 'Yes' END)")
- But that doesn't work
Thank you for help,
...ANSWER
Answered 2022-Jan-12 at 22:22CASE
& THEN
are not supported in google's query language
try:
QUESTION
My current T-SQL query provides the following results:
Query:
...ANSWER
Answered 2021-Dec-23 at 22:22Window functions allow you to have fields in your select along with aggregate functions. You can do something like this
QUESTION
While converting some Access queries to T-SQL, I came across the Access function IIf. I read the documentation here and understand it takes 3 parameters: the expression, the if true, and the if false. What I have yet to find is if the "false" param is required? And if a false is not provided, what is the behavior?
UPDATE: When this question was asked, I did not know if the query worked with only 2 parameters (b/c I can not run the query in Access). I did, however, suspect it might work (with only 2 params) b/c a few queries I am converting (to T-SQL) have nested IIF's and the last IIF has only 2 params.
...ANSWER
Answered 2021-Dec-13 at 18:54It's IIf
, not IFF
. All arguments are required in VBA and textbox expressions and both must be calculatable (no error result such as DivBy0) because both parts will be calculated - if either errors, the entire expression errors. The IIf() in Access query works differently - 'falsepart' calculates only if 'truepart' fails and if 'falsepart' is not provided, expression returns Null if 'truepart' fails.
Try some expressions and see what happens. One for testing: IIf(1=2,"T")
.
QUESTION
I'm trying to create a procedure that will:
- take any number as an input e.g.
102
- find the sequence range it belongs e.g.
100 to 103
- return a suggested next number to the user e.g.
104
The table itself will look something like this:
Num 100 101 102 103 110 111 112 113 114 115 120 121Ideally the output of the query would return something like this:
start end nextNr 100 103 104 110 115 116 120 121 122I this what I'm trying to do is linked to some kind of Gap and Island technique. I had a look at trying something from here but couldn't quite get it to work. Gaps and Islands Link
This is what I tried coming up with...
...ANSWER
Answered 2021-Dec-09 at 16:05Perhaps this will help.
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