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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 · update table if ( sql%rowcount = 0 ) then insert end if; 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!
Using only SQL (no PL/SQL) how would I write a MERGE (or UPDATE?) statement that would update the role_name as below, but only for rows where another row with the new role_name does not already exist? (By "new role_name" I mean 'prefix-' || role_name) UPDATE role SET role_name = 'prefix-' || role_name WHERE role_name LIKE 'com.example.%';
create table bridge (t1_key number, t2_key number, t1_id number, t2_id number) The T1.id is natural key. update bridge. set t1_key = (select key from t1 where t1.id = bridge.id) where exists (select key from t1 where t1.id = bridge.id) The T2.id is natural key. update bridge.
Consider the following statement that uses the NOT EXISTS operator: SELECT * FROM table_name WHERE NOT EXISTS (subquery); Code language: SQL (Structured Query Language) (sql) 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 ...
