How to order by column A and then by column B?
The SQLite website has syntax diagrams explaining the SQL grammar supported by SQLite.
select
Postgresql column reference “id” is ambiguous
You need the table name/alias in the SELECT part (maybe (vg.id, name)) :
MySQL error: Unknown column in ‘where clause’
backticks (`) are used for identifiers, like table names, column names, etc. Single quotes(‘) are used for string literals. You want to do: Or, to be more explicit: When there is no chance of ambiguity, and when table/column names do not have special characters or spaces, then you can leave the ` off. Here is … Read more
DATEDIFF function in Oracle
In Oracle, you can simply subtract two dates and get the difference in days. Also note that unlike SQL Server or MySQL, in Oracle you cannot perform a select statement without a from clause. One way around this is to use the builtin dummy table, dual:
MySQL Select Multiple VALUES
Try or: Or the equivalent in:
SQL conditional SELECT
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.
grant select on view
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
SQL: Two select statements in one query
You can do something like this: See, for example: https://dev.mysql.com/doc/refman/5.0/en/union.html
Create a temporary table in a SELECT statement without a separate CREATE TABLE
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
How to write a SQL DELETE statement with a SELECT statement in the WHERE clause?
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