How to use IN() Operator not working it’s. Those table are example and look the same as the real database I have.I don’t have the permitting to add tables or change Those are the tables: When I use this query it return me only the student with id =1 because “id IN (students)” return 1 …
Aggregate functions across multiple columns in postgres
I have a postgresql table with multiple fields containing integers (a1,a2,a3 etc). I want to run aggregate functions(mean, standard deviation etc) across more than one of the columns at once. (Some of them may have a reasonable number of nulls, so I don’t want to just generate column averages and then a…
How do I use a subquery to show a column that has never been assigned to a different table?
I’m trying to Write a SELECT statement that returns the category_name column from the Categories table and returns one row for each category that has never been assigned to a product in the Products table. there are four categories in the categories table and only three have been used in the products ta…
Printing integer variable and string on same line in SQL
Ok so I have searched for an answer to this on Technet, to no avail. I just want to print an integer variable concatenated with two String variables. This is my code, that doesn’t run: It seems like such a basic feature, I couldn’t imagine that it is not possible in T-SQL. But if it isn’t po…
Select a value from table with different criteria SQL
TABLE player idPlayer | name | 1 | name1 | 2 | name2 | 3 | name3 | 4 | name4 | Table matches idMatch | idPlayer1 | idPlayer2 | date | 1 | 1 | 2 …
Select a specific index row in sqlite
I have an index and I need to find out what is the row in a table with that index, in SQLite. Example: Index = 1 Table: Which is the correct SELECT that I can use to solve my problem? Answer Typically to get a specific row you can always request them by rowid, e.g. However, there are some atypical
EXTRACT the date and time – (Teradata)
I am trying to extract the date and time from a field in Teradata. The field in question is: VwNIMEventFct.EVENT_GMT_TIMESTAMP Here is what the data look like: 01/02/2012 12:18:59.306000 I’d like …
PL/SQL fill variable with if-condition value
i am trying to fill a variable in PL/SQL with an if-condition value like this: v_variable := if(4 > 3) THEN ‘A’ ELSE ‘B’ END; but this doesnt work. Are there any options to do this? Answer Instead of doing this with an if, I’d go with case:
MyBatis Batch Insert/Update For Oracle
I’ve recently started learning to use myBatis.I am now facing such a scenario, I need to constantly fetch a new list of Objects through WebService, then for this list, I need to insert/update each …
Why use GTIDs in MySQL replication?
When it comes to database replication, what is the use of global transaction identifiers? Why do we need it to prevent concurrency across the servers? How is that prevention achieved exactly? I tried to read the documentation at http://dev.mysql.com/doc/refman/5.7/en/replication-gtids.html but still could not…