USING ( Simple-column-Name [ , Simple-column-Name ]* ) USING clause definition The USING clause specifies which columns to test for equality when two tables are joined. It can be used instead of an ON clause in the JOIN operations that have an explicit join clause. If a column in the...
Enter DEL with no clauses to delete the current line of the buffer. The buffer has no command history list and does not record SQLcl commands. I[NPUT] [text] Adds one or more new lines of text after the current line in the SQL buffer. The buffer has no command history list and ...
The WITH BACKUP clause, and the optional USING 'backup_identifier' clause, can be used to create a backup of the keystore before the new master encryption key is created. See also ADMINISTER KEY MANAGEMENT in Oracle Database SQL Language Reference for Release 18 or 12.2. Note: To en...
You can also filter the table by entering a Where clause in the Filter box. The table contents can be displayed using any Oracle application or tools, such as Oracle Application Express, Oracle BI Answers, Oracle BI Dashboards, and so on. C. When you are done viewing the results, dismis...
For example, the fastest way to execute a query with an ORDER BY clause in a disk-based RDBMS is if the base table happens to be stored in sorted order using the same column as in the ORDER BY clause. That is of course very unlikely. The next best case is if the order can be ...
官方的定义是,MySQLmust do an extra pass to find out how to retrieve the rows in sorted order. The sort is done by going through all rows according to the join type and storing the sort key and pointer to the row for all rows that match the WHERE clause . The keys then are sorted ...
In this scenario, the package gives a name to a specific Oracle error number using the PRAGMA EXCEPTION_INIT statement. You can then handle the exception by name with its own exception handler or by number within a WHEN OTHERS clause. Let’s look at an example. The DBMS_DEFER package asso...
To explain this behaviour, we need to understand how Oracle processesROWNUM. When assigningROWNUMto a row, Oracle starts at 1 and only only increments the value when a row is selected; that is, when all conditions in the WHERE clause are met. Since our condition requires thatROWNUMis greater...
If no Boolean expression is true, then the CASE expression returns the result expression in the ELSE clause if an ELSE clause exists; otherwise, it returns a null value. Like the simple CASE expression, Oracle also uses short-circuit evaluation for the searched CASE expression. In other words...
Make sure to turn on supplemental logging if your replication task updates a table using a WHERE clause that doesn't reference a primary key column. To manually set up supplemental logging Run the following query to verify if supplemental logging is already enabled for...