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How SID is different from Service name in Oracle tnsnames.ora
...ich this instance connects. You can
specify multiple services names in
order to distinguish among different
uses of the same database. For
example:
SERVICE_NAMES = sales.acme.com,
widgetsales.acme.com
You can also use service names to
identify a single service that is
availab...
SQL, Postgres OIDs, What are they and why are they useful?
... handy for tables where you don't have a primary key, have duplicate rows, etc. For example, if you have a table with two identical rows, and you want to delete the oldest of the two, you could do that using the oid column.
OIDs are implemented using 4-byte unsigned integers. They are not unique–...
What is the main difference between Inheritance and Polymorphism?
...ntrast I think it is useful when you want to have student, driver, teacher etc. as Person and you group them under a List or something. So when you call 'read' for all, everyone calls their own 'read' method.
– savante
Jun 22 at 19:44
...
Git: can I suppress listing of 'modified content'/dirty submodule entries in status, diff, etc?
Somewhen (around the 1.6.x releases, I think) git became aware of changes inside submodules. That only serves to annoy me:
...
MySQL INSERT INTO table VALUES.. vs INSERT INTO table SET
... readability, and the elimination of typos caused by mixing up your column order when writing your VALUES clause. My gut tells me that on net the good outweighs the bad, but your judgement may differ.
– Mark Amery
Oct 18 '14 at 23:01
...
angular.element vs document.getElementById or jQuery selector with spin (busy) control
...need jquery.
Edit: Note that jQuery should be loaded before angularJS in order to take precedence over jqLite:
Real jQuery always takes precedence over jqLite, provided it was
loaded before DOMContentLoaded event fired.
Edit2: I missed the second part of the question before:
The issue wit...
How do I list all versions of a gem available at a remote site?
...ut it in a string so that we're sure we pass it 1-1, i.e. gem list '^rhc$' etc.
– mgol
Oct 2 '13 at 3:04
1
...
How to select rows that have current day's timestamp?
...t
WHERE DATE(timestamp) = CURDATE() --- using DATE(timestamp)
ORDER BY timestamp ;
Explain:
ID SELECT_TYPE TABLE TYPE POSSIBLE_KEYS KEY KEY_LEN REF
1 SIMPLE test ALL
ROWS FILTERED EXTRA
6671 100 Using where; Using filesort
It filters all (6671) rows and ...
How to use a servlet filter in Java to change an incoming servlet request url?
...
@datakey: just either rearrange the ordering or add <dispatcher>FORWARD</dispatcher> to filter mapping.
– BalusC
Jan 17 '14 at 10:23
...
LaTeX table positioning
... Sorry, but the claim that it's necessary to run \restylefloat{table} in order to use the [H] positioning specifier is false. One should only ever run \restylefloat{table} if one has first run the package instructions \floatstyle, \floatplacement, or \floatname. Please update your answer to remove...