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I'm a new beginner to Oracle ,I'm so confused about the data types .
I don't know the difference between :
INT,INTEGER,NUMBER
CHAR,CHAR VARYING ,CHARACTER,CHARACTER VARYING
Integer datatype is now deprecated and it is equivalent to NUMBER(38,0). The keyword is retained for compatibility.
Also you can check the Oracle PL/SQL book
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Are there any examples of the code for the Column generation problem (cutting stock problem or any other problem) using google OR tools in C++?
Yes, as the name suggests, this does the job:
https://github.com/google/or-tools/blob/stable/examples/cpp/strawberry_fields_with_column_generation.cc
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I was searching already a while and still i am not sure there is any function to split string in Informix db 11.70? Should I write my own function to make my task real or I missed something?
I think you are looking for SUBSTR function,
please refer to this page list of string manipulation functions:
https://www.ibm.com/support/knowledgecenter/SSGU8G_14.1.0/com.ibm.sqls.doc/ids_sqs_0258.htm#ids_sqs_0258
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I know that SQL is different in various databases. But I need to know which functions are predicates in source SQL as language standart (not vendor solutions).
I found:
CONTAINS
EXISTS
IS NULL
IS NOT NULL
Is it all? Or did I lose smth?
Are all predicates use the TVL?
P.S. Sorry if I wrote stupidity, I'm a noobie in the database but I need to know it for exam.
You can refer here:
ANSI SQL Framework
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In which version of Oracle is over clause is present? What is the purpose of this clause?
The OVER clause specifies the partitioning, ordering & window "over which" the analytic function operates
Reference:
OVER clause in Oracle
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I'm using SQL Server DB and I would like to write query which will look for a fields with two or more slashes in it, lets say we have these rows:
1. abc/def/g
2. abcd/efg
3. a/b/c/d/e/f/g
So it should return 1st and 3rd row! What is the easiest way to do so?
Thanks in advance!