i want to know if the main query can see the alias, here’s an example: Does the first query see the alias “values”? Answer Does the first query see the alias “values”? Yes, it does. The subquery creates a derived table, and aliases act as column names in that context. However, standard SQL requires that you give an alias to
Tag: subquery
Select only newer records among the result of a query that extracts duplicate rows in a db
I have a db where I can have multiple rows with same field “aid” (it’s a sort of historical changelog of same items). With the following query, I’m extracting rows with same aid orderd by descending date: That should be a child table related to a father layer (made by a postgres materialized view that shows only newest aid records)
SQL: Select certain rows with window functions in MySQL/MariaDB
My problem can be simplified to the following example: Now I’m looking for an sql statement which selects all rows (ordered by dfrom) having a dfrom not between the dfrom and dto of any previously selected row, possibly using window functions to get informations on other rows, like this: resulting in: Can anyone give me the necessary sql statement? Answer
SELECT NOT IN with multiple columns in subquery
Regarding the statement below, sltrxid can exist as both ardoccrid and ardocdbid. I’m wanting to know how to include both in the NOT IN subquery. Answer I would recommend not exists: Note that I changed the table aliases to things that are more meaningful. I would strongly recommend prefixing the column names with the table they belong to, so the
Is there a way to order by value increase compared to older entries in MYSQL?
I want to order each ID by the percentage increase in a three day timeframe. If there is no entry three days ago, it should move up the date until today’s date. In the following I have explained the …
Oracle – Count based on previous and next column
I’ve got a rather unusual question about some database query with oracle. I got asked if it’s possible to get the number of cases where the patient got a resumption on the same station they were discharged from within 48 / 72 hours. Consider the following example: Case Station From To 1 Stat_1 2020-01-03 20:10:00 2020-01-04 17:40:00 1 Stat_2 2020-01-04
How to write this SQL query more elegantly ( joining + max query )
Ok I am using the following example from w3school https://www.w3schools.com/sql/trysql.asp?filename=trysql_select_all and I want to get the date in which the amount was ordered This works but my guts tell me I need to use joining or having ?? Answer You want the date of the order that has the maximum quantity. It does not look like you do need two
Query help in SQL
I have the below table, with empid, deptid, and Name. I need to get the results as empid,deptid,name and count of employees in each department. I need to get the results as empid,deptid,name, and count of employees in each department as below. I am able to achieve results using the below queries. Is it possible to do this in alternate
SQL Statement summarize missing employee certifications
I am trying to create a report on tables that I can’t modify and am not sure if this is even possible. Using the script below, I am trying to get a query result of: Answer You can cross join employees and certifications to generate all possible combinations, then use a subquery to check whether each tuple exists in the
SQL – Find Record count for multiple tables at a time in snowflake
I want to see counts have Tables at 1 time, instead of Running each. For EX: select COUNT(*) from “Fact_MASTER “; select COUNT(*) from “Dim_MASTER “; select COUNT(*) from “…