Goal: I’m looking for a declarative and repeatable way of “applying” SQL table schemas to a database What I’ve tried Below is a SQL script that does what I want (as best as I can tell from my superficial knowledge of MySQL and with some manual testing): If the table doesn’t exist…
How to use triple INNER JOIN with one empty table?
Given is the following table: A project can be either owned by a user (user_id), OR by an organization (org_id) So either field is 0. So I do an INNER JOIN on projects, users, and organizations, but if the project is owned by a user (and currently no organization does exist at all), the result is empty. Does …
Creating thread safe MyBatis sessions from a java.sql.Connection
I’m trying to use MyBatis with a Snowflake database. My situation is similar to that of this poster: Configure mybatis to use an existing connection Essentially, I can get a java.sql.Connection Object, but I cannot get that by way of a DataSource, or other steps normally done by RDBMS databases like Ora…
Need assistance in using round on a current query
I have the following query where would you add ROUND () if you want to limit the rating to 2 decimal places? Answer By adding the round before the avg I got it.
How do store a list of sorted tables with an SQL SHOW TABLES statement?
I am using the following code to show all tables, but how do I store the tables into a sorted array: The following code spits out the data: Answer Put the table names in a PHP array, and then sort the array. And if you don’t nest it in the row, you don’t need nested loops when you process it.
Left join only on first row
I have the following sample query: and I’d like the following output I read many questions on the similar topic but I wasn’t able to make it work. Answer You can use row_number():
SQL to detect if one column contains another column
I try to query as following: I need to detect if voucher contains REV and give flag on row level. I tried OVER PARTITION but with no success. Any ideas? Answer Use a CASE expression and EXISTS:
Convert String to Date/Time in Report Builder query in SQL
I have a column ENTRY_MONTH with dates in it as a string like 11/2017. I’m trying to convert the column to datetime, preferably the last day of each month, so in the example above would be 11-30-2017. I’ve tried to no avail. Any advice? Answer You can try something like: This uses a European forma…
An equivalent expression for MIN_BY in SQL?
In SQL we have the function MIN_BY(B,C), which returns the value of B at the minimum of C. How would one get the same functionality, but without using the MIN_BY function? i.e. given columns A,B,C, I want to group by A and return the value of B that corresponds to the minimum of C. I can see there must be
Data Joining of two Tables MS Access SQL
I have two tables named – 1) Students 2) Classes. ClassID is Primary Key of Classes table and Foreign Key of Students Table. I want to access one row from the Students table having specfic RollNo (This RollNo is given by user input) and all rows from Classes Table. Students Table is given as:- RollNo is…