I am looking to construct a SQL query which is able to sum up installment values by month. Ordinarily this wouldn’t be too hard as you would simply sum the installment values and group by month. …
How is this code adding a number to a datetime without using DATEADD? [closed]
In the following SQL statement there’s some T-SQL that adds a number to a datetime and to a date: declare @t table(UserID int, StartDate datetime, EndDate date) insert @t select 1, ‘20110101’, ‘…
How does Hibernate do row version check for Optimistic Locking before committing the transaction
When before committing the current transaction hibernate checks the version of the row, it should issue an sql select statement for fetching ithe row. Assume that after issuing that select statement hibernate finds out that the row version is not changed, hence it should proceed with committing the transactio…
How to clamp a float in PostgreSQL
I have a number 1.00000001, and I want to clamp it between -1 and 1 to avoid input out of range error on ACOS() function. An MCVE look like this: SELECT ACOS( 1 + 0.0000000001 ); My ideal would be …
regexp_like that mirrors contains near
I’m trying to speed up a query that uses Contains Near with one that uses regexp_like. The initial Contains Near query takes about 45 minutes to run. Clob Column holds large “documents” and is …
ora-02270 How do i fix this?
This is what I have: CREATE TABLE STUDENTS( stu_id NUMBER(9) NOT NULL, stu_name VARCHAR2(15) NOT NULL, stu_address VARCHAR2(15), stu_major VARCHAR2(6), CONSTRAINT students_pk …
How can I specify column name casing in TypeORM migrations
I’m using typeORM and I want to use migrations instead of syncing because I’m working in a team and it’s actually a lot of tedious work to get the db to a state in which the app actually functions. …
Select equal number of records for the WHERE conditions
I have a database and over one million records in it. I want to get the same number of records from the database for 3 different conditions. I am currently using code that performs 3 MySQL queries. I …
Code that would show the countries with a greater GDP than any country
I am new to SQL and was trying to solve a question on SQLzoo Select the code that would show the countries with a greater GDP than any country in Africa (some countries may have NULL gdp values). …
group by JSON Column that contains an array
I have the following table: that contains these data: How can I group by my array items in my JSON Column? and get this result: