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How to create index on JSON field in Postgres?
In PostgreSQL 9.3 Beta 2 (?), how do I create an index on a JSON field? I tried it using the -> operator used for hstore but got the following error:
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Compare two Byte Arrays? (Java)
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edited Mar 26 '11 at 3:18
Stephen C
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Define static method in source-file with declaration in header-file in C++
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Remove static keyword in method definition. Keep it just in your class definition.
static keyw...
Can I use GDB to debug a running process?
...trace
with PTRACE_ATTACH, or through children calling PTRACE_TRACEME.
3 - no attach: no processes may use ptrace with PTRACE_ATTACH nor via
PTRACE_TRACEME. Once set, this sysctl value cannot be changed.
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Differences between “java -cp” and “java -jar”?
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answered Aug 12 '12 at 13:59
Andreas DolkAndreas Dolk
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Is git's semi-secret empty tree object reliable, and why is there not a symbolic name for it?
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3 Answers
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Find an element in a list of tuples
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answered Feb 3 '10 at 12:10
Nadia AlramliNadia Alramli
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How can i get the session object if i have the entity-manager
...() for new applications.
So with Hibernate as JPA 2.0 implementation (see 3.15. Native Hibernate API), you would do:
Session session = entityManager.unwrap(Session.class);
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Select rows of a matrix that meet a condition
...can define a column by name:
m[m[, "three"] == 11,]
Or by number:
m[m[,3] == 11,]
Note that if only one row matches, the result is an integer vector, not a matrix.
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what is the difference between a portlet and a servlet?
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answered Sep 26 '09 at 6:13
topcheftopchef
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