Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!
index is for distribution data index does not have to be unique
primary key must be unique and non null
primary keys are automatically indexed
Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!
http://plsql4all.blogspot.com/2014/08/auto-increment-column-in-teradata.html http://stackoverflow.com/questions/21982004/how-to-generate-automatic-number-in-teradata-sql https://forums.teradata.com/forum/enterprise/auto-increment-column
R: 4 W: 2 X: 1
Make a directory readable to other people.
chmod 755 dir
Make a file readable to other people.
chmod 644 file
Make a directory and all its subcontents readable to other people.
# make the dir and its subcontents readable and executable
chmod 755 -R dir …Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!
beneficiary
perfunctory
bimonthly vs semimonthly
every one vs everyone, every thing vs everything, etc.
numeric vs numerical
chicken: white meant -> breast, dark meat -> leg
Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!
the wrong way
for(auto it=l.cbegin(); it!=l.cend(); ++it){
for(auto jt=++it; jt!=l.cend(); ++jt){
cout << *it << " <-> " << *jt << endl;
}
}
it is increased again in the inner …
Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!
in real problems, the true value of (some quantity) are usually unknow/defined, even if we can collect data about it, e.g., Amazon goods, what is the true cost of …