Recent questions tagged Sql

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sql - How to add conditional where clauses in rails

I am a rails newbie and am trying to perform a search on a table with rails, and i'm just using my sql ... use ActiveRecord, but how? Thank you See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - Primary Key Sorting

Is a table intrinsically sorted by it's primary key? If I have a table with the primary key on a ... The performance difference is significant. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql server - SQL 2005 CTE vs TEMP table Performance when used in joins of other tables

I have a complex query that I need to use in a subsequent query (actually update statement). I have tried ... the temp table approach. Thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql server 2008 r2 - SQL how to convert row with date range to many rows with each date

If I have a table that looks like this begin date end date data 2013-01-01 2013-01-04 7 2013-01-05 ... , contributes to very long query times. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - How to identify invalid (corrupted) values stored in Oracle DATE columns

Oracle 10.2.0.5 What is the easiest way to identify rows in a table that have "invalid" values in DATE ... "invalid" values in DATE columns. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - substring of variable length

I have a table with a column which contains strings like below. RTSPP_LZ_AEN RTSPP_LZ_CPS RTSPP_LZ_HOUSTON RTSPP_LZ_LCRA ... of doing it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql server - MSSQL record date/time auto delete

I want to delete records from a db table based on a time-stamp for each record. I would like to have it ... services I could use as templates? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - Is RIGHT JOIN Ever Required?

Do any queries exist that require RIGHT JOIN, or can they always be re-written with LEFT JOIN? And more specifically, ... t3 ON t3.k3 = t2.k3 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - Resources Exceeded during query execution

I'm trying to run a query joining 2 large sets of data and I'm hitting the resources exceeded during ... BY firstyear, firstmonth, days_elapsed See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - How to script out stored procedures to files?

Is there a way that I can find where stored procedures are saved so that I can just copy the files to my desktop? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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400 views

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sql - Set time portion of a datetime variable

I am working on a query that will be an automated job. It needs to find all the transactions between 8 PM and ... both variables to be 8:00 PM? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - Display Parent-Child relationship when Parent and Child are stored in same table

I have SQL Server table structure like below: ID Name ParentID ----------------------- 1 Root NULL ... Finance How can I construct my SQL query? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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333 views

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sql - selecting the Row of table Except the First one

i want to select all the row except the Top One so can anybody help me on this Query. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - Why use the BETWEEN operator when we can do without it?

As seen below the two queries, we find that they both work well. Then I am confused why should we ever use ... = 5000 AND salary <= 15000; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - Why select Top clause could lead to long time cost

The following query takes forever to finish. But if I remove the top 10 clause, it finishs rather ... = cap2.CustomerReferenceNumber ) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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558 views

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sql - #1146 - Table 'phpmyadmin.pma__tracking' doesn't exist

Having a problem opening any of my databases in phpMyadmin I tried deleting a lot of old, irrelevant databases ... .pma__tracking' doesn't exist See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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304 views

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sql server - Optimal performing query for latest record for each N

Here is the scenario I find myself in. I have a reasonably big table that I need to query the latest ... link to the execution plan image. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - How to find maximum avg

I am trying to display the maximum average salary; however, I can't seem to get it to work. I can ... maximum average for each worker? Thanks. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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405 views

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sql - Mysql delete order by

I have a table and I only display the latest 30 rows by order by ID. I'm trying to delete any rows after the ... line 1 What am I doing wrong? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql server - SQL Management Studio won't open scripts on double-click

I'm used to double-clicking *.sql script files to open them in SQL Server Management Studio. I recently ... just like you would expect. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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557 views

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sql - NOLOCK vs. Transaction Isolation Level

What's the difference between using "SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED" and NOLOCK? Is one better than the other? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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358 views

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sql - Oracle Pivot query gives columns with quotes around the column names. What?

I'm trying to use PIVOT in Oracle and I'm getting a weird result. It's probably just an option I need to ... running my query or a Toad thing. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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262 views

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sql - Oracle - Best SELECT statement for getting the difference in minutes between two DateTime columns?

I'm attempting to fulfill a rather difficult reporting request from a client, and I need to find away to get the ... there any way to do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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308 views

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sql - Group by month in SQLite

I have an SQLite database which contains transactions, each of them having a price and a transDate. I want to retrieve ... 230 2 500 3 400 4 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql server - How to catch the output of a DBCC-Statement in a temptable

I tried the following on SQL-Server: create table #TmpLOGSPACE( DatabaseName varchar(100) , LOGSIZE_MB decimal(18, ... error... Any sugestions? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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290 views

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sql - Behaviour of NOT LIKE with NULL values

I want to fetch all columns of a table except of columns of type serial. The closest query to this ... rationale behind this are welcome. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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324 views

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sql - SELECT ONE Row with the MAX() value on a column

I have a pretty simple dataset of monthly newsletters: id | Name | PublishDate | IsActive 1 | Newsletter 1 ... PublishDate = MAX(PublishDate). See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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323 views

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sql server - What are the rules for using "Internal" parameters in SSRS

There is an option to create "Internal" parameters in SSRS: In what context are they used? What are the ... rules for using internal parameters? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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