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11 lis 2015 · You could use the SQL%ROWCOUNT Oracle variable: UPDATE table1 SET field2 = value2, field3 = value3 WHERE field1 = value1; IF (SQL%ROWCOUNT = 0) THEN INSERT INTO table (field1, field2, field3) VALUES (value1, value2, value3); END IF;
19 lip 2022 · You can use MERGE with bind variables. To do this, use DUAL as the source table and join a primary or unique key on the target table to a variable. Supply the bind variables as the inputs for the INSERT & UPDATE sections. All the PL/SQL variables in this MERGE statement are bind variables.
11 cze 2020 · 1. check if the record exist or not by doing select count(*)into l_Cnt from emp where empid=p_empid; 2. If record does not exist raise NO_DATA_FOUND, and alert program this person does not exist. 3. If person exists, then do update emp set ..... where empid=p_empid; 4. Now here, can I say if
5 gru 2019 · the exists just wastes time. the update will do the "read" and if it finds something -- the update, if not the insert will happen. this would be true in sqlserver as well!
as long as you are using the CBO, the not exists will be rewritten to NOT IN if that is better -- so it is OK. if you are using the RBO, the not exists will be run as an index probe for sure, assuming an index on the columns, so just hope the outer table is not "big"
19 mar 2012 · If exists update else insert. A frequent occurrence when writing database procedures is to handle a scenario where given a set of fields, for example a new employee record, update the existing employee record if it exists otherwise create it. Often this problem is solved with a select statement and then an IF statement, eg: declare.
The NOT EXISTS operator returns true if the subquery returns no row. Otherwise, it returns false. Note that the NOT EXISTS operator returns false if the subquery returns any rows with a NULL value. Oracle NOT EXISTS examples. See the following customers and orders tables in the sample database:
