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Postgres unique constraint vs index
As I can understand documentation the following definitions are equivalent:
8 Answers
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How to remove item from list in C#?
...s {
public int ID; public string FirstName; public string LastName;
}
and assigned some values to results as follows:
var results=new List<myClass> {
new myClass() { ID=1, FirstName="Bill", LastName="Smith" },
new myClass() { ID=2, FirstName="John", LastName="Wilson" },
new ...
CodeIgniter activerecord, retrieve last insert id?
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Shame on me...
I looked at the user guide and the first function is $this->db->insert_id();
This also works with activerecord inserts...
EDIT: I updated the link
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Rails :include vs. :joins
... that requires it. In some cases, you know the join will be more efficient and will not incur the risk of duplication.
– Jonathan Swartz
Nov 21 '13 at 0:28
1
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Oracle SQL: Update a table with data from another table
...ere is no matching row in t2. Without it, every row in t1 will be updated and the values will be set to NULL if there is no matching row in t2. That is generally not what you want to happen so the WHERE EXISTS is generally needed.
– Justin Cave
Aug 5 '13 at 1...
SQL select only rows with max value on a column [duplicate]
...ou join your table to the sub-query with equality on both group-identifier and max-value-in-group:
SELECT a.id, a.rev, a.contents
FROM YourTable a
INNER JOIN (
SELECT id, MAX(rev) rev
FROM YourTable
GROUP BY id
) b ON a.id = b.id AND a.rev = b.rev
Left Joining with self, tweaking join...
jQuery Selector: Id Ends With?
...this selector with CSS, like pseudo-selectors?
– Alejandro Nava
Oct 31 '16 at 21:22
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Explicitly set Id with Doctrine when using “AUTO” strategy
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Thank you and I'm happy to help a bit as I can :)
– nicolasbui
Dec 5 '12 at 18:20
2
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How to reset sequence in postgres and fill id column with new data?
I have a table with over million rows. I need to reset sequence and reassign id column with new values (1, 2, 3, 4... etc...). Is any easy way to do that?
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How do I put an 'if clause' in an SQL string?
...rder_status = 'COMPLETED'
WHERE purchaseOrder_ID = '@purchaseOrder_ID' and
not exists (SELECT *
FROM itemsOrdered WHERE purchaseOrder_ID = '@purchaseOrdered_ID' AND status = 'PENDING'
)
However, I might guess that you are looping at a higher...