Recent questions tagged SQl

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sql server - Select back a comma delimited list grouped by an ID

I've got the following tables: EntryTag --------- EntryID TagID Example putput (EntryID, TagID): 1 2 ... tagNames.EntryID) as tags FROM Content See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql server - T-SQL for finding Redundant Indexes

Is anyone aware of a T-SQL script that can detect redundant indexes across an entire database? An example of a ... 2 would be redundant. Thanks. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - Select Rows with Maximum Column Value group by Another Column

This should be a simple question, but I can't get it to work :( How to select rows that have the ... with the same docgroupviewid. Any ideas? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql server 2008 - Executing the same SSIS Package with different parameters at different time

I have a SSIS package running at 8 PM in the evening for the Year 2011. I would like to run the same package ... way to solve it? Thanks all. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql server - Using an Alias column in the where clause in ms-sql 2000

I know you cannot use a alias column in the where clause for T-SQL; however, has Microsoft provided ... SQL statement from OpenQuery results See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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182 views

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sql - Oracle <> , != , ^= operators

I want to know the difference of those operators, mainly their performance difference. I have had a look at ... in reality they are different. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql server - Why insert-select to variable table from XML variable so slow?

I'm trying to insert some data from a XML document into a variable table. What blows my mind is that the ... T1(ColumnNames) Thanks a bunch!! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - How to get Previous Value for Null Values

I have the Below Data in my Table. | Id | FeeModeId |Name | Amount| ----------------------------------- ... 6000 | | 8 | 3 | Quarter-3 | 4000 | See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - How do I perform update query with subquery in Access?

I want to port this SQL query, which works just fine on SQL Server, MySQL, and Oracle, to an ... VendorRegKeys.CreatedBy_ID = Users.User_ID See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql server - Conditional SQL ORDER BY ASC/DESC for alpha columns

Writing a stored procedure in MS SQL Server 2008 R2, I want to avoid using DSQL... I would like ... deriving numbers from sorted strings though See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - Where does the practice "exists (select 1 from ...)" come from?

The overwhelming majority of people support my own view that there is no difference between the following statements ... they are equivalent. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql server - How to convert number of minutes to hh:mm format in TSQL?

I have a select query that has DURATION column to calculate number of Minutes . I want to convert those minutes to ... ) as 'Duration (Minutes)' See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - MAX vs Top 1 - which is better?

I had to review some code, and came across something that someone did, and can't think of a reason why my way is ... why, and if that's right. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - When using GETDATE() in many places, is it better to use a variable?

By better, I mean does it improve performance by some non-marginal amount? That is to say, each time I ... whether or not it is significant. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - Postgres - Function to return the intersection of 2 ARRAYs?

In postgresql, you can use the && operator to return t (true) if two arrays have common members, i.e. they overlap. ... ARRAY[2, 3]); ARRAY[2] See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql server - Determine row size for table

How to I determine the maximum row size for a table? I'm looking for a tool or script that does this so I don' ... but I want to find the rest. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - Counting the number of occurrences of a substring within a string in PostgreSQL

How can I count the number of occurrences of a substring within a string in PostgreSQL? Example: I have a table ... o the column name contains. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - "This SqlTransaction has completed; it is no longer usable."... configuration error?

I've been working on this for about a day and a half now, and searched numberous blogs and help articles on the ... help... please let me know. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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391 views

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sql - MySQL Convert latin1 data to UTF8

I imported some data using LOAD DATA INFILE into a MySQL Database. The table itself and the columns are ... ENGINE InnoDB CHARACTER SET utf8; See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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439 views

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sql - How to aggregate over rolling time window with groups in Spark

I have some data that I want to group by a certain column, then aggregate a series of fields based on ... portion of the example accordingly. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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207 views

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sql - Database independence through JDBC in java

There are some limitations of using JDBC and database dependency is one of those limitations. Is there any pattern ... every SQL related DBMS? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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476 views

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sql - How to store a one to many relation in MySQL database?

I'm making a website and I need to store a random number of data in my database. For example, User john ... infinite number of values per user. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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458 views

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sql server - sql geography to dbgeography?

Maybe I'm missing something. I have a sql server column of the "Geography" datatype. I want to use the ... from sql's geography to dbgeography? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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328 views

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sql - Procedurally transform subquery into join

Is there a generalized procedure or algorithm for transforming a SQL subquery into a join, or vice versa? That is, ... cases do they not apply? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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213 views

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sql - Conditional aggregation performance

Let us have the following data IF OBJECT_ID('dbo.LogTable', 'U') IS NOT NULL DROP TABLE dbo.LogTable SELECT ... their data in the memory anyway. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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543 views

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sql - Prevent duplicate values in LEFT JOIN

I faced a situation where I got duplicate values from LEFT JOIN. I think this might be a desired behavior but ... of need a generic solution. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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246 views

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sql - Is merge statement available in MySQL

I have to use INSERT and UPDATE in single query. For that SQL having MERGE statement. Is MERGE statement ... supported, please provide sample. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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293 views

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sql - like '%' does not accept NULL value

I have query that is build from user's inputs ( passed via html form). It looks like (simple example): Select * ... but i have to deal with it. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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