Question : I have a query where I chain two columns. Why does the alias not work in the GROUP […]
Tag: alias
Mysql Alias IF statement
Question : How do you query something like if parent = 0 then alias is network_id else alias is group_id […]
How to create a view from a join with multiple duplicate column names?
Question : I have a few tables with this sort of format myTable: id | Table1_id | Table2_id | Table3_id […]
How to easily show very long “canonical” name for each column in all reports?
Question : Related: Does the length of a table name affect performance? For query writing purposes I want to have […]
Aliases with correlated subqueries
Question : I am looking at an example of correlated subquery with aliases from a PostgreSQL book: bpsimple=# SELECT * […]
Why can’t I use a cname/alias in the permissions table?
Question : At work we have a usual setup with web server(apache) and database server(mysql). From time to time there […]
When are COLUMN aliases in FROM clauses needed?
Question : FROM provides column_alias, the SQL spec calls these <derived column list> clauses. This is what the postgres docs […]
What does `x` stand for in this query?
Question : select convert(varchar(10), TotalSeconds / 3600) +’:’+ convert(varchar(10), TotalSeconds % 3600 / 60) +’:’+ convert(varchar(10), TotalSeconds % 60) as […]
Why do I get an error when filtering subSelect?
Question : select “masters”.*, (select avg (rating) from “reviews” where “master_id” = “masters”.”id”) as rating from “masters” where rating > […]
Subqueries’ aliases same as main queries’ aliases
Question : I have an SQL query whose aliases are the same as some of its subquery’s aliases. For example: […]