Αποτελέσματα Αναζήτησης
15 Νοε 2010 · UPDATE ( SELECT f1.firstfield, f2.anotherfield, f2.something FROM file1 f1 WHERE f1.firstfield like 'BLAH%' INNER JOIN file2 f2 ON substr(f1.firstfield,10,20) = substr(f2.anotherfield,1,10) ) AS my_files(firstfield, anotherfield, something) SET firstfield = ( 'BIT OF TEXT' || something )
The UPDATE statement updates the values of specified columns in rows of a table, view or nickname, or the underlying tables, nicknames, or views of the specified fullselect.
The UPDATE statement modifies zero or more rows of a table, depending on how many rows satisfy the search condition that you specify in the WHERE clause. You can use an UPDATE or MERGE statement to specify the values that are to be updated in a single row. You can specify constants, host variables, expressions, DEFAULT, or NULL.
An UPDATE statement will reset the AREO* state of a table if all conditions are true: The statement is a searched UPDATE statement. An UPDATE statement within a SELECT statement will not reset the AREO* state. The expression in the SET clause is not a scalar-fullselect or row-fullselect.
The INNER JOIN clause combines each row from the first table with every row from the second table, keeping only the rows in which the join condition evaluates to true. The following shows the syntax of joining two tables using the INNER JOIN clause: SELECT. select_list. FROM.
This tutorial shows you how to use Db2 joins including inner join, left outer join, right outer join, and full outer join to combine rows from two tables.
I want to do an update, updating only the values affected, but my update query has a join, so where exists won't work. update semester_workload tA. set tA.account = (SELECT DISTINCT (t2.WORKING - t2.WORKLOAD) FROM SEMESTER_WORKLOAD t1. join SEMESTER_WORKLOAD t2 on t1.ID_LECTURER = t2.ID_LECTURER.
