describe.h | Simple BDD describe test thingy for C | Functional Testing library
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Simple BDD describe test thingy for C
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QUESTION
Is there a way in Impala to determine whether an object name returned by SHOW TABLES corresponds to a table or a view since:
- this statement only return the object names, without their type
- SHOW CREATE VIEW is just an alias for SHOW CREATE TABLE (same result, no view/table distinction)
- DESCRIBE does not give any clue about the type of the item
Ideally I'd like to list all the tables + views and their types using a single operation, not one to retrieve the tables + views and then another call for each name to determine the type of the object.
(please note the question is about Impala, not Hive)
...ANSWER
Answered 2020-Oct-02 at 10:12You can use describe formatted
to know the type of an object
QUESTION
The SPARQL Describe query does not do anything in Anzograph 2.2.0. I have also double checked the documentation at https://docs.cambridgesemantics.com/anzograph/v2.2/userdoc/describe.htm and the simple example fails to return triples.
To reproduce, let's insert some data.
...ANSWER
Answered 2020-Sep-28 at 16:18It looks like you have hit a bug in the way the AnzoGraph web console processes the DESCRIBE query results. This has now been ticketed and will be addressed in an upcoming release - probably 2.2.1 (the next one). The AnzoGraph CLI does handle DESCRIBE correctly.
Many thanks indeed for the report!
QUESTION
How can I print the column statistics for an SQL table like number of unique values, max and min value, etc?
I am interested in statistics the command line tool csvstat or pandas' describe
and min
/max
/mean
methods print out.
Note: I do not want to load the data completely in memory, so that pandas can analyse them.
Is there any command line tool which reads the SQL data on the fly to create these statistics?
...ANSWER
Answered 2020-Sep-18 at 14:18If you need just a rough estimate, you can access Oracle's data dictionary's statistics, that Oracle maintains automatically, generally daily. The table ALL_TAB_COL_STATISTICS
has number of distinct values, number of nulls, and minimum and more.
The documentation says that minimum and maximum values for a particular column are held in the columns LOW_VALUE
and HIGH_VALUE
in the ALL_TAB_COL_STATISTICS
table but those columns are a data type RAW(1000)
so the data in those columns may need to be decoded.
If you need to occasionally get better estimates, you can invoke the dbms_stats.gather_table_stats procedure before querying the ALL_TAB_COL_STATISTICS
table.
QUESTION
How to find inside Gemfire region, what column defined as key during data load ?
List and describe is not giving required info
Example i am.looking something smiler to oracke "ALL_CONSTRAINTS" where you can run following sql to find primary key
...ANSWER
Answered 2019-Nov-06 at 09:40I'm not entirely sure about what you mean by find inside Region, but my guess is that you're trying to find wether a particular entry exists within a given GemFire region.
If that's the case, then you can use the get method from the Region class. If you want to use GemFire SHell directly instead of a custom Java application, on the other hand, you can use the get command. Last, but not least, you could also execute a OQL query with the query command, as an example: query --query="SELECT e.value FROM /MyRegion.entries e WHERE e.key='myKey'"
Hope this helps. Cheers.
QUESTION
I have recently created an erroneous merge hyperlink in clear case. This was the result of a script that automerged several files. Given that a script created the erroneous merge, I am trying to search for other instances of erroneous merge arrows. Below are the constraints I want to put in my search:
- All merge hyperlinks created by me.
- On a specific date
This question talks about finding a merge hyperlink in one file. However, I am looking for a set of merge hyperlinks that I created.
What I knowI know that you can describe hyperlinks as shown below:
Describe a hyperlink.
...
ANSWER
Answered 2019-Sep-12 at 20:21Consider cleartool find to try and link those hlink
QUESTION
I am looping through a list of clearcase files to see if the text "Merge <-" is not part of the output of ct describe
.
I have tried running a while loop on this list of clearcase files then appending it to another file if it meets my desired condition. Below is the exact logic I used:
...ANSWER
Answered 2019-Jun-17 at 22:18As I explained in "What is the difference between $(command)
and `command`` in shell programming?"
embedded command substitutions and/or the use of double quotes require careful escaping with the backslash character.
We prefer $( ... )
In your case, do try with
QUESTION
Context:
I am trying to understand how top
attribute of describe()
works in python (3.7.3) pandas
(0.24.2).
Efforts hitherto:
I looked into documentation of pandas.DataFrame.describe. It states that:
If multiple object values have the highest count, then the count and top results will be arbitrarily chosen from among those with the highest count.
I am trying to understand which part of code exactly attributes to the "arbitrary" output.
I stepped into the code which is being called by
describe
in-turn. My traceback is as follows:
ANSWER
Answered 2019-Jun-05 at 09:17As pointed out above, it gives "Down" arbitrarily, but not randomly. On the same machine with the same Pandas version, running the above code should always yield the same result (although it's not guaranteed by the docs, see comments below).
Let's reproduce what's happening.
Given this series:
QUESTION
I have a pandas DataFrame and I would like to get the basic stats about it like the number of unique values, number of occurrence for each values. Something like df.describe
.
My issue is that some columns have lists, and I get this error :
...ANSWER
Answered 2017-Jan-05 at 11:07Transform to tuples, which are hashable:
QUESTION
I convert tables from one format to another, from uncompressed to compressed (Snappy, Gzip etc).
I thought I could rely on describe [formatted|extended] tblname
until I read this. DESCRIBE Statement
It states
The Compressed field is not a reliable indicator of whether the table contains compressed data. It typically always shows No, because the compression settings only apply during the session that loads data and are not stored persistently with the table metadata.
How do I find out if a table is compressed and what codec is used? I don't mind using Spark to get that info.
...ANSWER
Answered 2018-Jan-23 at 11:48Answering my question:
For Avro data files : avro-tools getmeta filename
For Parquet data files : parquet-tools meta filename
QUESTION
Scipy's (to date, version 0.19.1) Statistical Functions module (aka scipy.stats
) contains the functions of scipy.stats.skew and scipy.stats.kurtosis to compute skewness and kurtosis of a data set (3rd and 4th statistical moments, respectively). Moreover, scipy.stats.describe calls these functions.
The definitions of skewness and kurtosis may vary; hence, no consensus on them in the literature. Then, which mathematical expressions are used in Scipy to define skewness and kurtosis in the two aforementioned functions with their default settings?
...ANSWER
Answered 2018-Jun-06 at 15:05Both scipy.stats.skew and scipy.stats.kurtosis call the function of scipy.stats.moment, which computes the following for the k-th central moment of a data sample:
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