Sounds like they want the ability to return only allowed fields, which means the number of fields returned also has to be dynamic. This will work with 2 variables. Anything more than that will be getting confusing. Dynamic SQL will help with multiples. This examples is assuming atleast 1 column is true.
The error message should be written like this: ORA-01720: “grant option” does not exist for COLLDESK.GESTIONES. Here’s how it works: You have 3 schemas: Schema1 – Holder of a table named “table1” Schema2 – Holder of a view “view1” selecting from schema1.table1 Schema3 – User, selecting from schema2.view1 – has no select granted on schema1.table1. … Read more
You can do something like this: See, for example: https://dev.mysql.com/doc/refman/5.0/en/union.html
From the manual found at http://dev.mysql.com/doc/refman/5.7/en/create-table.html You can use the TEMPORARY keyword when creating a table. A TEMPORARY table is visible only to the current session, and is dropped automatically when the session is closed. This means that two different sessions can use the same temporary table name without conflicting with each other or with … Read more
You need to identify the primary key in TableA in order to delete the correct record. The primary key may be a single column or a combination of several columns that uniquely identifies a row in the table. If there is no primary key, then the ROWID pseudo column may be used as the primary … Read more
You can actually do this one of two ways: MySQL update join syntax: ANSI SQL syntax: Pick whichever one seems most natural to you.
Use brackets to group the OR statements. You can also use IN
I think you should not rely on the implicit conversion. It is a bad practice. Instead you should try like this: or like
You could try some sort of COALESCE trick, eg: SELECT COALESCE( CASE WHEN condition1 THEN calculation1 ELSE NULL END, CASE WHEN condition2 THEN calculation2 ELSE NULL END, etc… )
This part: makes it possible to introduce a variable without the need of a seperate query. So the first query could also be broken down into two queries like this: for instance when used in a stored procedure.