I have a property sheet (ID int,SourceID int,TargetID int,TargetType int)
ID SourceID TargetID< br />———————
1 123 456
2 456 789
3 1 123
4 456 1
5 2 1
I want to find all circular references. I want to write a PL/pgsql function for this.
here ID 4 = 456 1 123 456 circular reference
I am using Postgres 9.5. If I update some values of a row and submit them, is there a way to get the old values later? I was wondering if there is something like flashback? But this will be a s
I load about 300GB of contour data into the postgis table. To speed up the process, I read that it is the fastest to load the data first, and then create an index. It only takes about 2 to load the
For testing purposes, I clear (delete) each table before executing the code.
for table in reversed (db.metadata.sorted_tables):
engine.execute(table.delete())
do_stuff() However, the id valu
Two players take turns picking candies from n heaps, the player who picks the last one will win the game.On each turn they can pick any number of candies which come from the same heap( picking no c
Questions about SQLite.
In CREATE TABLE SQL, we can add UNIQUE constraints in any way: column-constraint or table-constraint. My question is simple. Do they work differently?
The only d
When I select a table view row, it turns blue. When I touch it, I want the row to not change color. How can I do this? Each cell requires one of these:
When I select a row of a table view,
Table of Contents
SELECT DISTINCT field 1, field 2… FROM table name WHERE condition GROUP BY field HAVING filter ORDER BY field LIMIT limit the number of entries 1.2 keyword execution prior
