While I’m trying to get all accounts, which received message from foo@gmail.com. I want to know about the performance of two following query. or Thanks! Answer Always use the first query in such situations. Don’t use DISTINCT inside an IN clause subquery, though. Don’t try to tell the DBMS h…
Tag: join
SQL Select from multiple tables and count third
I want to count number of rows in table that is referenced by two fields of other tables. I’ve the following structure Result that I want to achieve The statement that I’ve tried, but getting error at right join What I’m missing? Answer You are quite close. Main problems with your query: you…
SQL Join on table with revision dates
I am about to begin working on a solution for my company in SQL that requires me to link product category mappings based on a SKU number. The problem is that the category mappings can change, and they will have a date associated with the change. For example: Product 1 is currently mapped to category A. User r…
Creating Postgres View getting ERROR: column “id” specified more than once
SCENARIO: I have this select statement that JOINs a bunch of tables together: I’d like to create a Postgres View. So wrote it out like this: I keep getting this error: ERROR: column “id” specified more than once QUESTIONS: How do I fix this error? I would like to create a view called “…
Create group column with values based on join [closed]
I have two tables 1) a customer table 2)Account table. I want to see what accounts are primary and which are secondary accounts. In one table I have accountRowId and AccountNumber. In the other …
Sql reverse search for products and discounts
I have two table, one for products, and one for discounts. Discounts table look like: ID | Name | Percentage | Product Name Search Param ——————————————————-…
Bigquery Full Join ON multiple conditions
I want to perform a Full Outer join on two tables with multiple conditions to result all the matching records along with unmatched records from both tables. Tbl1 is a bigger table with 21 M records and Tbl2 has 5k rows, like the example query below. But the outer join cannot be performed with OR conditions be…
MySQL – Joins and Subqueries [closed]
Closed. This question needs debugging details. It is not currently accepting answers. Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question. Closed 2 years ago. Improve this question IR…
How do i make a sql query using more than one tables with onde condition for each?
i want to get some data from a table but separated by different conditions, for example how many lines have a column are equal to 1, how many have a column equal and the same until the number 5. i did …
Conditionally joining from multiple tables
Does SQL allow some form of conditional “table choosing” within the Join statement? ie. selecting a different table to join based on a predefined variable/condition. The error I get when attempting this method is ORA-00905: missing keyword. Answer No. Neither SQL nor Oracle allow this, unless you …