Im a bit new to sql and for my project I need to do some Database sorting and filtering: Let’s assume my database looks like this: What should I do to only have the last column with the same email te be returned: Thanks in advance! Answer SQL Query: Hope this solves your problem. Thanks.
Full SQL statement logging on Dropwizard
I’ve a Dropwizard application using JDBI and SQL Server. I would like to get all SQL statements logged with their parameters but I don’t seem to be able to. This is what’s usually recommended to do: logging: level: INFO loggers: “org.skife”: TRACE “com.microsoft.sqlserver.j…
What’s the meaning of RESTRICT in Foreign Keys?
There is 4 cases: (For example I’m talking about ON DELETE) CASCADE: the referencing rows will be deleted automatically along with the referenced ones. SET NULL: the value of referencing record will be set to NULL automatically along with the referenced ones. NO ACTION: There will not be any change in t…
Select only 5 random rows in the last 50 entries
I’m just starting with MySQL so I would like to know how can I select only 5 random rows in the last 50 entries of my database? I hope you understand my question. I’m using PDO and what I have now is …
how django ‘auto_now’ ignore the update of specified field
i have a model, like this: name = models.CharField(max_length=255) modify_time = models.DateTimeField(auto_now=True) chasha = models.CharField(max_length=255) stat = models.CharField(…
hive – is it possible to create a column from another column
I was wondering if it is possible to create a new column from an existing column in hive. Lets say I have a table People (name string, age int) and I want to add a column is_old string which would be …
How to create heat map on a table in SSRS?
How can I create like this in SSRS? The color will change from red to green based on a value in a row (Underwriter). And all that in a group: Answer You can do this by right clicking on the individual cells and setting the fill colour based on an expression: In the Image below I’ve mistakingly put ̶…
Can’t delete a row using entity framework
The problem that I’m having is that I can’t delete a row when using entity. I’m able to find the row, but the error I get the next error: Additional information: Store update, insert, or delete statement affected an unexpected number of rows (0). Entities may have been modified or deleted si…
What is the difference between cube, rollup and groupBy operators?
I can’t find any detailed documentation regarding the differences. I do notice a difference, because when interchanging cube and groupBy function calls, I get different results. I noticed that for the result using cube, I got a lot of null values on the expressions where I used to use groupBy. Answer Th…
Perform same SQL query on multiple databases
I’m trying to adapt an SQL query to check the value present in a certain field that is present in every database on my server. There are 100 individual databases, and I would like to check a specific record of each one. The answer is probably to use a command like the one below, but I’m having dif…