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How can I get a list of all functions stored in the database of a particular schema in PostgreSQL?
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After some searching, I was able to find the information_schema.routines table and the information_schema.parameters tables. Using those, one can construct a query for this purpose. LEFT JOIN, instead of JOIN, is necessary to retrieve functions without parameters.
SELECT routines.routine_name, pa...
Why is the Fibonacci series used in agile planning poker? [closed]
...nd verbal description in the software domain is closer to the one shown in Table 3 than to Saaty’s." And in this table we see that something is called "slightly bigger" if it is 125% of the base size and it is called "bigger", if it is 175% of the base size.
– asmaier
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Unique constraint that allows empty values in MySQL
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@MianAnjum bolded: CREATE TABLE table (key int(11) NOT NULL AUTO_INCREMENT, field tinyint(1) DEFAULT NULL)
– Paul Nowak
Sep 19 '17 at 19:45
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How to convert SQL Query result to PANDAS Data Structure?
...ctor not properly called!, it appears that the tuple of tuples is not acceptable for DataFrame constructor. There is also no .keys() on cursor either in dictionary or tuple mode.
– Mobigital
Jan 20 '19 at 20:45
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hexadecimal string to byte array in python
...hex(hex_string)
bytearray(b'\xde\xad\xbe\xef')
Note that bytes is an immutable version of bytearray.
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Storing sex (gender) in database
...the 'closest' data type would be tinyint with a CHECK constraint or lookup table as appropriate.
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SQL how to make null values come last when sorting ascending
I have a SQL table with a datetime field. The field in question can be null. I have a query and I want the results sorted ascendingly by the datetime field, however I want rows where the datetime field is null at the end of the list, not at the beginning.
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How do you convert a byte array to a hexadecimal string, and vice versa?
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Text: 718,380.63 (1.0X faster)
Sentence: 39.71 (1.0X faster)
Lookup tables have taken the lead over byte manipulation. Basically, there is some form of precomputing what any given nibble or byte will be in hex. Then, as you rip through the data, you simply look up the next portion to see what...
Is “ ” a replacement of “ ”?
... the same except for the fact that the latter does not need another lookup table to find its actual value. The lookup table is called a DTD, by the way.
You can read more about character entity references in the offical W3C documents.
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How to create index on JSON field in Postgres?
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Found:
CREATE TABLE publishers(id INT, info JSON);
CREATE INDEX ON publishers((info->>'name'));
As stated in the comments, the subtle difference here is ->> instead of ->. The former one returns the value as text, the lat...