Structured Query Language (SQL). For questions about the language, not Microsoft SQL Server (tag sql-server).

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32
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6answers
56k views

How do I efficiently get “the most recent corresponding row”?

I have a query pattern that must be very common, but I don't know how to write an efficient query for it. I want to look up the rows of a table that correspond to "the most recent date not after" the ...
1
vote
2answers
226 views

Enabling Edition Based Redefinition failed with ora-33819. Could I query why?

I want to enable Edition Based Redefinition for a user. Executing this command gives an ORA-33819 exception: ALTER USER user ENABLE EDITIONS; I know there's an option to enable it with the ...
2
votes
1answer
3k views

How to find column with all same repeating character

I have a char(15) NOT NULL column. I need to see if it is empty or contains all zeros. I can obviously do= '000000000000000' But is there a way using LIKE so its not hard coded to 15? I don't see why ...
2
votes
4answers
2k views

Is there any rule of thumb to optimize sql queries like this

this is my first question here. Although I've been helped out from this forum over a hundred times. I was having difficulties in optimizing sql query. It takes hours to execute. Record set is also ...
0
votes
1answer
125 views

Maximum granularity of user permissions (certain rows within table?) [closed]

Our current system architecture is fairly simple. There's a global list of devices, which move between gateways. The idea is such that the global list of devices is stored in one table, such that any ...
1
vote
1answer
3k views

Select on several {name,value} pairs

I have a this schema: CREATE TABLE Pairs( id VARCHAR(8) NOT NULL ,name VARCHAR(40) NOT NULL ,value VARCHAR(1000) NOT NULL ,PRIMARY KEY (id,name)); I want to write a query to ...
3
votes
4answers
501 views

How to design a table that each rows have 5K boolean attributes?

I have about 2M rows and each row looks like the following. 244 true false ... true -> One integer column(V) and about 5K boolean columns(B1, B2, ..., B5K) associated to the integer. Due to the ...
0
votes
1answer
148 views

Implicitly (or proxy) convert to Nvarchar on incoming queries from legacy or 3rd party applications

We have a 3rd party application of which we don't have the source code. This application executes queries on our database without using the "N" prefix before literal strings. It does this in inserts ...
1
vote
1answer
310 views

Query_cache doesn't work with join

I have a simple join query, but for some reason query_cache won't cache it! SELECT id, news, approve, FIXED, DATE, allow_main FROM post LEFT JOIN post_plus ON post.id = post_plus.news_id WHERE ...
0
votes
2answers
2k views

Which schema is better for a shopping project? [closed]

I'm working on a business-to-customer project that has variety of product types. There are a few properties like name, description, brand_id that each product has but there are also many specialized ...
-1
votes
0answers
92 views

ERROR 1136 Need help mysql [closed]

I am working on my sql via mysql. I need help with a code. I am able to create the table; however, I am having trouble installing the data into the table with out getting the ERROR 1136. CREATE ...
2
votes
2answers
2k views

How to use OR in query with priority?

In a simple query like SELECT * FROM table WHERE id='x' OR id='y' How to give a priority to get only one of the WHERE clauses? I mean getting rows with id='x'. Only if there is no row, get row ...
-4
votes
1answer
98 views

Sproc - Adding columns with matching ID column [closed]

I currently have a sproc that is used for reporting on a table similar to the one below: ID Weight QTY OtherData 1 20 12 1234 1 44 4 1234 ...
1
vote
2answers
638 views

ROWNUM equivalent in Centura SQLBase (aka Gupta)

Clarification: This is NOT MS SQL server. [As there is no suitable tag for centura-database and I am not allowed creating tags I had to use this generic one - sorry about that] I have a Centura ...
0
votes
3answers
2k views

inner joins with where clause for no values?

I have 2 tables : Table1 Parent(varchar) Child (varchar) Table2 C1(varchar) PC (varchar) Sample data: Requirement - I need Table2.C1 values for which column Table2.PC = Table1.Child , ...
3
votes
2answers
290 views

Can I run concurrent backups of multiple read only filegroups?

I have 62 readonly filegroups in a SQL server 2008 enterprise database. Can I backup multiple read only filegroups at the same time? I would assume this to be the case but given this database is over ...
2
votes
1answer
3k views

A network-related or instance-specific error occurred

I have been using a local database on my laptop for the last view weeks. But today I cannot access it. I get the error: A network-related or instance-specific error occurred while establishing ...
1
vote
1answer
1k views

The ordinal position for a column changed without my knowledge

I have a column that is out of order (ordinally, not in terms of select statement), and I just can't figure out how it got that way. I've been researching this for quite some time and am coming up ...
0
votes
1answer
150 views

Grouping rows by looking at two columns without considering the order

I have a table looks like this one below: +----+---------+---------+ | ID | VALUE 1 | VALUE 2 | +----+---------+---------+ | 01 | A | B | | 01 | B | A | | 02 | C | D ...
0
votes
1answer
93 views

how to Update Value in local tabel when job Finished

I need to update some values into a database as soon as all the tasks of Executing Service have finished executing there jobs. In other words, I want do something like status when the all jobs ...
3
votes
2answers
709 views

Configure Email to be sent on restoring a database

Is there a way to configure Email in SQL Server such that an Email is sent when a particular database is restored.
1
vote
1answer
3k views

Postgresql vs MySQL - Which is better for join queries & writing data(inserts) [closed]

I have to design a database which will end up with 50M records in a single table(there will be other tables with lesser number of records). I'm more concerned with join queries & writing ...
0
votes
1answer
221 views

Can I design this database better? [closed]

I have the following database design: Script to reproduce: /* DROP TABLE [dbo].[feedback] DROP TABLE [dbo].[action] DROP TABLE [dbo].[download] DROP TABLE [dbo].[user] DROP ...
0
votes
1answer
1k views

Return all possible combinations for each group

I have got a table looks like this one here shows the student ID and all classes this student took: +-------------+ | ID | Class | +-------------+ | 01 | A | | 01 | B | | 01 | C | | ...
1
vote
1answer
67 views

Conditional Counting

I'm analyzing a database of login records for a university and I'm trying to write a query that will give me an idea as to how many users are using the labs for short bursts, verse a more extended ...
1
vote
1answer
603 views

Optimising a query of an SSRS dataset

Consider the query given below: SELECT * FROM ((SELECT c.cust_id , c.username , REPLACE(qs.seg_type_ref_key_02, 'N/A', 'Non Vip') casino_group, ...
2
votes
0answers
230 views

How to index for a group by with columns from different tables?

Is it possible to create an index from columns of 2 different tables? If not, how do we optimize a query that does a group by on columns of 2 different tables? For example: the following ...
6
votes
4answers
9k views

How to find unused indexes?

I am working on a Data warehouse. I have tables with up to 200M records. Some of these tables have around 20+ indexes (I can't provide a reason why they have been created in the first place). This is ...
3
votes
1answer
389 views

Combine - Select Into, with Insert Into Select

I've read many explainations like this one here that say "Select Into ..." is to create new tables and "Insert Into ..." is to append to existing tables. I'm automating a coworker's sql scripts. ...
2
votes
1answer
5k views

SQL Server select with regex

Can we use regular expression to select the item from database? The table item is like below Table column|name| 10.01.02 | a | 100.2.03 | b | 1021.10.04 | c | Now my problem is that i ...
1
vote
1answer
523 views

Data modeling membership and profiles

Anyone have an idea on how to solve this issue. Im modeling my membership and user profile DB and run into one issue I have to solve. I have this layout of tables. Membership (where all basic info ...
3
votes
2answers
221 views

How do I deal with items that I need to repeat monthly?

I have a table where users will enter transactions on a weekly basis, these transactions will either be single items or will be recurring i.e. rent would be recurring and should be the same for every ...
1
vote
0answers
117 views

MySQL Replication fails - commands received in wrong order?

The other day, I had this issue with one of our MySQL 5.1.60 master and 5.1.61 slave setups: Last_Error: Error 'Can't create table 'foobar.#sql-4b87_2' (errno: 150)' on query. Default database: ...
1
vote
1answer
551 views

PostgreSQL indeterminate ordering of results [closed]

When I have this query: SELECT DISTINCT "spree_products".id FROM "spree_products" INNER JOIN "spree_variants" ON "spree_variants"."product_id" = "spree_products"."id" AND ...
2
votes
1answer
462 views

Getting the most out of SQL Server with a million rows a day [closed]

I have a windows service that is inserting 1000 rows at 1 minute intervals to a SQL Server 2008 Standard database table that looks like: id, datetime, key_id, value key_id is a foreign key to ...
1
vote
4answers
1k views

Pick one single row each time from either table?

I will run a query and get a list of aID and based on that I will try to match below tables.For each aID I just want one record either from tblGAlert or tblEAlert based on gDateTime and eDateTime ...
0
votes
1answer
591 views

Why would running a SQL query overnight break my database for the following day?

I apologise in advance if this is a duplicate question (which I bet it will be). I had a good search through and found similar questions but nothing that seemed an exact match. I wrote a report that ...
0
votes
1answer
43 views

SELECT to only see Offsetting Transactions in table?

I have a temp table like this I have been playing with it but I don't know how to get same PortCode,Cusip combo to give me only offsetting transactions (Buy,Sells) not (Purchase,Purchase) combos. ...
2
votes
2answers
583 views

SQL Server 2008 R2 : A Possible indexing strategy for the given schema?

We have these four tables: Store ( row bigint, id uniqueidentifier, name varchar ) Products ( row bigint, id uniqueidentifier, storeID uniqueidentifier, productname ...
2
votes
1answer
3k views

Postgres nested hstore select query

I have a carts table with items hstore column. An example entry in this column is: carts.items row#1 = { "1614" => {:quantity=>"100", :price_cents=>1655}, ...
1
vote
0answers
545 views

How to store object with property of generic type in DB

In my business domain there exists an entity parameter. Beside other properties which are identical for each parameter, they have values. These values can be of different data types. There might be ...
2
votes
1answer
74 views

How to go about modeling the main object of relationship?

I'm using MySQL and MyISAM tables. I have a bunch of objects that I want to group together 1 object belongs to 1 and only 1 group 1 group can have many objects 1 group has 1 required main object ...
3
votes
2answers
890 views

Efficiently query MAX over multiple ranges

When performing a MIN() or MAX() over a single range covered by an appropriately sorted index, SQL Server does a TOP() and so returns the value after fetching just one row. When the search criteria ...
3
votes
1answer
1k views

Dynamic file name for file import

I'm trying to figure out a way that I can pass a filename into a stored procedure that can import a file. However, after setting up the SQL dynamically, the object can't be found. DECLARE @fileName ...
1
vote
2answers
2k views

Improve performance with the WHERE NOT IN sub-select clause

In the following query, I have to count transactions for each customer. [EDIT]However, I have to exclude from the result set entirely, customers that have a transaction older than one year. ...
2
votes
1answer
2k views

Need Help Executing a Remote Task from SQL Server Agent

There is a scheduled task running on a batch server via the Windows Task Scheduler that sometimes overlaps with other scheduled jobs in the SQL Server Agent causing CPU issues. We can solve this if ...
0
votes
2answers
433 views

Oracle - Clause where in case when

all! I want to know how wrote this code of SQL, I already trying but i get message error. I wrote two way different this SQL. See you below SELECT * FROM tabela WHERE coluna IN (CASE WHEN 1 = ...
1
vote
1answer
457 views

Stored procedure to validate xml content against dtd

I have a stored procedure which creates xml content and then is stored to a xml file. Is it possible to validate the generated xml content against a dtd file? Thank you in advance!
2
votes
1answer
2k views

What is the difference between COUNT(*) and COUNT(*) OVER()

Take the following code example: SELECT MaritalStatus, COUNT(*) AS CountResult COUNT(*) OVER() AS CountOverResult FROM (schema).(table) GROUP BY Marital Status COUNT(*) ...
5
votes
1answer
9k views

Get result of joining multiple tables as one row

I have these 2 tables: table1: id | name --------- 1 | john 2 | jack table2: id | profile_id | institution ----------------------------- 1 | 1 | SFU 2 | 1 | UBC 3 | 2 ...