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Fastest way to count exact number of rows in a very large table?
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Simple answer:
Database vendor independent solution = use the standard = COUNT(*)
There are approximate SQL Server solutions but don't use COUNT(*) = out of scope
Notes:
COUNT(1) = COUNT(*) = COUNT(PrimaryKey) just in case
Edit:
SQL Server example (1.4 billion rows, 12...
Why does “split” on an empty string return a non-empty array?
Split on an empty string returns an array of size 1 :
8 Answers
8
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Detect if the app was launched/opened from a push notification
...s it possible to know if the app was launched/opened from a push notification?
26 Answers
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How do I find Waldo with Mathematica?
...orth America] puzzles, using Mathematica (image-processing and other functionality)?
5 Answers
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What is the difference between “long”, “long long”, “long int”, and “long long int” in C++?
I am transitioning from Java to C++ and have some questions about the long data type. In Java, to hold an integer greater than 2 32 , you would simply write long x; . However, in C++, it seems that long is both a data type and a modifier.
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How to remove application from app listings on Android Developer Console
Is there any way to unpublish and then permanently remove an application from the list of applications on Android Developer Console?
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How to stop/terminate a python script from running?
...o tokeniza 349 text files! How can I stop it? How can I stop a running Python program?
16 Answers
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Can I use mstest.exe without installing Visual Studio?
I want to use mstest.exe to run my unit test on build server, but I don't want to install Visual Studio on the build server. Can I just install MSTest without Visual Studio?
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Are there any smart cases of runtime code modification?
Can you think of any legitimate (smart) uses for runtime code modification (program modifying it's own code at runtime)?
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ORA-30926: unable to get a stable set of rows in the source tables
...solve the problem by using a DISTINCT in your query (in fact, if 'Y' is a constant value you don't even need to put it in the query).
Assuming your query is correct (don't know your tables) you could do something like this:
MERGE INTO table_1 a
USING
(SELECT distinct ta.ROWID row_id...