Group By X means put all those with the same value for X in the one group. Group By X, Y means put all those with the same values for both X and Y in the one group. To illustrate using an example, let’s say we have the following table, to do with who is attending what subject at … Read more
In your table dbo.Sup_Item_Cat, it has a foreign key reference to another table. The way a FK works is it cannot have a value in that column that is not also in the primary key column of the referenced table. If you have SQL Server Management Studio, open it up and sp_help ‘dbo.Sup_Item_Cat‘. See which column that FK … Read more
I think the main reason is for data integrity. If you have a relationship between two tables invoice and invoice_item. You won’t be able to add an invoice item that does not related to an invoice. This is what you want! It’s called referential integrity. It can get pretty messy in your database if you don’t have … Read more
Use sp_rename See: SQL SERVER – How to Rename a Column Name or Table Name Documentation: sp_rename (Transact-SQL) For your case it would be: Remember to use single quotes to enclose your values.
Basics SELECTing columns from a table Aggregates Part 1: COUNT, SUM, MAX/MIN Aggregates Part 2: DISTINCT, GROUP BY, HAVING Intermediate JOINs, ANSI-89 and ANSI-92 syntax UNION vs UNION ALL NULL handling: COALESCE & Native NULL handling Subqueries: IN, EXISTS, and inline views Subqueries: Correlated WITH syntax: Subquery Factoring/CTE Views Advanced Topics Functions, Stored Procedures, Packages Pivoting data: CASE & PIVOT syntax Hierarchical Queries Cursors: Implicit and Explicit Triggers Dynamic … Read more
You can’t concatenate an int to a string. Instead of: You need: To help illustrate what’s happening here. Let’s say @RowTo = 5. In order to build that into a string (even if ultimately it will be a number), I need to convert it. But as you can see, the number is still treated as … Read more
Remove the course_enrollment_settings.base_price immediately after CASE: CASE has two different forms, as detailed in the manual. Here, you want the second form since you’re using search conditions.
Ubuntu 16.04 (EASY): Find out where you are allowed to write Then, just write there Mac OSX: Mysql installed via MAMP Find out where you are allowed to write NULL means you’re screwed so you have to create the file “~/.my.cnf” Enable read/write for MySQL installed via MAMP (on Mac): open “MAMP” use spotlight click … Read more
You can reset your root password. Have in mind that it is not advisable to use root without password.
If you really need this you can achieve your goal with help of separate table for sequencing (if you don’t mind) and a trigger. Tables Now the trigger Then you just insert rows to table1 And you’ll have | ID | NAME | —————— | LHPL001 | Jhon | | LHPL002 | Mark | Here … Read more