What is an index in SQL Server?
What is index in SQL? Can you explain or reference to understand clearly? Where should I use an index? I searched in Stack Overflow, but it is still not clear to me. ...
sql
MS SQL SERVER BACKUP Issue
In sql server 2008, i have taken Full backup type of my database and database was successfully done.My question is while restoring it how can i check or know that my whole backup was perfect ? ...
Java: JPQL search -similar- strings
What methods are there to get JPQL to match similar strings? By similar I mean: Contains: search string is found within the string of the matches entity Case-insensitive Small mispellings: e.g. "arow" matches "arrow" I suspect the first two will be easy, however, I would appreciate help with the last one Thank you ...
Directional Map Search
Hello, I am trying so write a bit of code that will search for a given point on a map, but in a given arc of a compass bearing. e.g. 45 degress (north-east), 20 degrees either side. So far I have got a SQL command that will give me the results in a given radius, need some help on how to filter it to a direction. SELECT * FROM (SELECT ...
Data Modeling Help - Do I add another table, change existing table's usage, or something else?
Assume I have the following tables and relationships: Person - Id (PK) - Name A Person can have 0 or more pets: Pet - Id (PK) - PersonId (FK) - Name A person can have 0 or more attributes (e.g. age, height, weight): PersonAttribute _ Id (PK) - PersonId (FK) - Name - Value PROBLEM: I need to represent pet attributes, too. As it t...
SQL: ... WHERE X IN (SELECT Y FROM ...) ...
Is the following the most efficient in SQL to achieve its result: SELECT * FROM Customers WHERE Customer_ID NOT IN (SELECT Cust_ID FROM SUBSCRIBERS) Could some use of joins be better and achieve the same result? ...
T-SQL - Find differences for PK's in a single table (self join?)
Hi Experts, My situation is this. I have a table of products with a pk "Parent" which has "Components" The data looks something like this Parent(PK) Component Car1 Wheel Car1 Tyre Car1 Roof Car2 Alloy Car2 Tyre Car2 Roof Car3 Alloy Car3 Tyre Car3 Roo...
Mysql console slow on import of huge sql files
My import of sql via the mysql console is rather slow and as our sql file is increasing every day I would like to know if there are any alternatives on how to import a sql file faster. Changing to oracle or other systems is no option, the configuration has to stay the same. Currently the sql file is: 1.5 Gb I'm on Wamp with Apache 2.2....
Checking for reciprocal relationships in mysql. A trivial one table problem.
I have a mysql table that stores relationships. Items can be related to another item in one direction, or both items can be related to each other. I want to return all items related to my primary item - but I also want to check to see if the related item has a 'reverse relationship' to the current item and show this as a boolean |----...
Excel Spreadsheet - Best way to perform an Oracle Query on a cell
Hi there, I have an Excel Spreadsheeet. There is a cell containing a concatenated name and surname (don't ask why), for example: Cell A2 BLOGGSJOE On this cell, I would like to run the following SQL and output it to cell A3, A4 and A5 SELECT i.id, i.forename, i.surname FROM individual i WHERE UPPER(REPLACE('" & A2 & "', ' ', '')) =...
Comparing arrays with sql
I want to perform a 'SELECT' statement with a byte array (binary) parameter as a condition. I tried to google it, but didn't find anything useful. In general, I keep information of files in the database. one of the properties is the file's hash (binary). I want to give a hash to the SELECT statement, and get all rows with the same hash...
Text replace with regex in SQL Server
Currently I have a SQL server column of type nvarchar(max) which has text that starts with <span class="escape_<<digits>>"></span> The only thing that varies in the pattern is the <<digits>> in the class name. The common part is <span class="myclass_ and the closing </span> Some sample values are <span class="myclass_12">...
MySQL - are FK's useful / viable in a web app?
Hi all, I've encountered this discussion related to FK's and web applications. Basically some people say that FK's in web applications doesn't represent a real improvement and can even make the application slower in some cases. What do you guys think, what's your experience? edit : note that I'm aware of FK's job and objective, I'm ju...
Counting multiple rows in MySQL in one query
I currently have a table which stores a load of statistics such as views, downloads, purchases etc. for a multiple number of items. To get a single operation count on each item I can use the following query: SELECT *, COUNT(*) FROM stats WHERE operation = 'view' GROUP BY item_id This gives me all the items and a count of their views. ...
jpa join query on a subclass
I have the following relationships in JPA (hibernate). Object X has two subclasses, Y and Z. Object A has a manyToOne relationship to object X. (Note, this is a one-sided relationship so object X cannot see object A). Now, I want to get the max value of a column in object A, but only where the relationship is of a specific subtype, ie...
Finding efficient overlapped entries in a SQL table
What is the most efficient way to find all entries which do overlap with others in the same table? Every entry has a start and end date. For example I have the following database setup: CREATE TABLE DEMO ( DEMO_ID int IDENTITY , START date NOT NULL , END date NOT NULL ); INSERT INTO DEMO (DEMO_ID, START, END) VALUES (1...
Strange Values in SYS.DM_TRAN_LOCKS table RESOURCE_ASSOCIATED_ENTITY_ID column
I’ve been trying to understand some strange values in the RESOURCE_ASSOCIATED_ENTITY_ID column of SYS.DM_TRAN_LOCKS when RESOURCE_TYPE is “OBJECT”. Although these should be object Ids, I cannot determine what object they actually refer to. I’ve tried everything I can think of, including querying all system tables with columns of type IN...
Sql Trigger Trouble
Hey guys i cant get this trigger to work, ive worked on it for an hour or so and cant see to figure out where im going wrong, any help would be appreciated CREATE OR REPLACE TRIGGER allergy BEFORE INSERT ON DECLARE med VARCHAR2(20); BEGIN SELECT v.medication RCD.specify INTO med FROM visit v, relcondetails RCD WHERE ...
Synchronizing non-DB SQL Server objects
There are a number of tools available for synchronizing Tables, Indexes, Views, Stored Procedures and objects within a database. (We love RedGate here, and throw a lot of money their way). However, I'm having a very difficult time finding tools that will help with Jobs, Logins and Linked Servers. Do these things exist? Am I missing som...
Type "Time" in SQL Server and C#
Is there any way that I can create the type time in C# to be compatible with the type time of the SQL server? ...