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22 lis 2012 · You do not need to use ORDER BY in your sub query - it is meaningless there. For primary/secondary sort, you use a single ORDER BY: SELECT Date_Réserve,Heure_Réserve FROM réserve ORDER BY Date_Réserve, Heure_Réserve
3 paź 2015 · I want the same column first orders Ascendant and then Descendant. I am trying. Query. Select t1.age, t2.age. from table1 t1. inner join table1 t2. on t1.name=t2.name. order by t1.age asc, t2.age desc. But in the result, both columns ordered in the same way.
16 lis 2014 · SELECT e.Name as EmployeeName, d.Location AS EmployeeLocation, de.Name AS ManagerName FROM EMPLOYEE AS e LEFT OUTER JOIN DEPARTMENT AS d ON d.Dep_Id = e.Dept_ID LEFT OUTER JOIN EMPLOYEE AS de ON de.Mrg_Id = e.Emp_Id The key point to take away is the use of AS to use table aliases so you can reference a table more than once, for different records.
6 dni temu · 3.1. In the SELECT Clause. First, we’ll take a look at an example with the Student and Exam tables, in which we’ll retrieve each student’s name and the number of exams they’ve taken: SELECT s.name, (SELECT COUNT (*) FROM Exam e WHERE e.student_id = s.id) AS exam_count FROM Student s;
How can I easily select a derived column again in the same query? Select COL1, COL2, <complex_functions> as COL3, COL3 / COL2 as COL4: from...
13 wrz 2018 · An application developer came to me with this question recently: “Can I use the same column twice in a SQL UPDATE statement?” Yes and no. It depends on what you mean by “use”. Let’s take an example where we’re updating a table called Monsters. Here’s the code to build it:
7 wrz 2024 · SELECT x.column1, y.column2 FROM Table_name x JOIN Table_name y ON x.common_field = y.common_field; So, this SQL query selects column1 from one instance of Table_name (aliased as x) and column2 from another instance of Table_name (aliased as y), where the values in common_field are the same in both instances of the table.
