by: Murali |
last post by:
Hi All
I was reading thro the posting(s) of Thomas Kyte and his nifty
approach to doing updates without the need for unnecessary correlated
subqueries. An alternative to correlated subquery...
|
by: Jason |
last post by:
Hello All,
I have a SQL Query with multiple correlated Subqueries in it. When it
gets executed it runs rather slow due to the size of the QT table.
Does anybody have any suggestions how to alter...
|
by: SQL_developer |
last post by:
Hello,
I am trying to update a column in a table with an 8 digit string.
The 8 digit number is obtained from another column which is a comments
field.
e.g.
Comments Field :
|
by: Venkata C |
last post by:
Hi!
Does anyone here know of a way to goad DB2 into converting a correlated
subquery to a non-correlated one? Does DB2 ever do such a conversion?
We have a query of the form
SELECT .. FROM A...
|
by: sql_server_user |
last post by:
Hi,
I have a history table with about 400 million rows, with a unique
composite nonclustered index on two columns (object id and time period)
which is used for most of the queries into the...
|
by: steven.fafel |
last post by:
I am running 2 versions of a correlated subquery. The two version
differ slightly in design but differ tremendously in performance....if
anyone can answer this, you would be awesome.
The "bad"...
|
by: debasisdas |
last post by:
Using Subqueries
==================
The sub query is often referred to as a nested SELECT, Sub - SELECT, or inner SELECT statement.
The sub query executes once before the main query.
The...
|
by: debasisdas |
last post by:
Using Co-related sub query
========================
While a subquery is evaluated only once for each table, a correlated subquery is evaluated once for each row.
Sub query can take value from...
|
by: lizandra |
last post by:
Greetings,
I am a newbie, I have been working to extract data from a basic sales db and trying to decide when I should use joins and when I should use subqueries. Much of what I read online says...
|
by: Faith0G |
last post by:
I am starting a new it consulting business and it's been a while since I setup a new website. Is wordpress still the best web based software for hosting a 5 page website? The webpages will be...
|
by: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 3 Apr 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome former...
|
by: ryjfgjl |
last post by:
In our work, we often need to import Excel data into databases (such as MySQL, SQL Server, Oracle) for data analysis and processing. Usually, we use database tools like Navicat or the Excel import...
|
by: Charles Arthur |
last post by:
How do i turn on java script on a villaon, callus and itel keypad mobile phone
|
by: aa123db |
last post by:
Variable and constants
Use var or let for variables and const fror constants.
Var foo ='bar';
Let foo ='bar';const baz ='bar';
Functions
function $name$ ($parameters$) {
}
...
|
by: ryjfgjl |
last post by:
If we have dozens or hundreds of excel to import into the database, if we use the excel import function provided by database editors such as navicat, it will be extremely tedious and time-consuming...
|
by: ryjfgjl |
last post by:
In our work, we often receive Excel tables with data in the same format. If we want to analyze these data, it can be difficult to analyze them because the data is spread across multiple Excel files...
|
by: BarryA |
last post by:
What are the essential steps and strategies outlined in the Data Structures and Algorithms (DSA) roadmap for aspiring data scientists? How can individuals effectively utilize this roadmap to progress...
|
by: Hystou |
last post by:
There are some requirements for setting up RAID:
1. The motherboard and BIOS support RAID configuration.
2. The motherboard has 2 or more available SATA protocol SSD/HDD slots (including MSATA, M.2...
|
16
