Assuming three columns in the table: ID, NAME, ROLE BAD: This will insert or replace all columns with new values for ID=1: BAD: This will insert or replace 2 of the columns… the NAME column will be set to NULL or the default value: GOOD: Use SQLite On conflict clause UPSERT support in SQLite! UPSERT syntax was added to … Read more
The keyword for Oracle PL/SQL is “ELSIF” ( no extra “E”), not ELSEIF (yes, confusing and stupid)
I’m mostly used to Apex 4.1, but this approach should work. You don’t need an LOV. Your report query should include both the MAST_ID and the TASK_NAME columns. Hide the TASK_NAME column and set MAST_ID as the linking column. If you set the Link Text (under Column Link) to #TASK_NAME#, you should get the desired result. Display As should be left at the default (Display as Text etc).
Many useful statements in SQL Server have to be at the beginning of a batch. These include create trigger, create stored procedure, and many others. What is a batch? It is basically a unit of compilation. It also limits the scope of local variables. I advise you to read about batches in the documentation. The simplest way to … Read more
I have installed MySQL server and trying to connect to it, but getting the error: I have checked my /tmp directory and there is no mysql.sock. I can’t find mysql.sock anywhere. I read that it might be in But I checked there as well and there is even no mysql directory, only some postfix thing … Read more
WHERE clause introduces a condition on individual rows; HAVING clause introduces a condition on aggregations, i.e. results of selection where a single result, such as count, average, min, max, or sum, has been produced from multiple rows. Your query calls for a second kind of condition (i.e. a condition on an aggregation) hence HAVING works correctly. As a rule of thumb, use WHERE before GROUP BY and HAVING after GROUP BY. … Read more
To start with you can’t do this: The HAVING clause can only contain things which are attributes of the aggregate groups. In addition, 1, 2, 3 is not valid in GROUP BY in SQL Server – I think that’s only valid in ORDER BY. Can you explain why this isn’t what you are looking for:
The @@identity function returns the last identity created in the same session. The scope_identity() function returns the last identity created in the same session and the same scope. The ident_current(name) returns the last identity created for a specific table or view in any session. The identity() function is not used to get an identity, it’s used to create an identity in a select…into query. The … Read more
You would mostly be using COUNT to summarize over a UID. Therefore COUNT([uid]) will produce the warning: Warning: Null value is eliminated by an aggregate or other SET operation. whilst being used with a left join, where the counted object does not exist. Using COUNT(*) in this case would also render incorrect results, as you would then be counting the … Read more
No, prior to Oracle version 12.2, identifiers are not allowed to exceed 30 characters in length. See the Oracle SQL Language Reference. However, from version 12.2 they can be up to 128 bytes long. (Note: bytes, not characters).