In this tutorial, you will learn how to use SQL DELETE statement to delete data in a table or multiple related tables. Performing SQL Operations from PLSQLThis chapter shows how PLSQL supports the SQL commands, functions, and operators that let you manipulate Oracle data. Overview of SQL Support in PLSQLBy extending SQL, PLSQL offers a unique combination of power and ease of use. You can manipulate Oracle data flexibly and safely because PLSQL fully supports all SQL data manipulation statements except EXPLAINPLAN, transaction control statements, functions, pseudocolumns, and operators. M4.gif' alt='Update Using Multiple Tables Sql Statements' title='Update Using Multiple Tables Sql Statements' />PLSQL also conforms to the current ANSIISO SQL standard. In addition to static SQL discussed in this chapter, PLSQL also supports dynamic SQL, which enables you to execute SQL data definition, data control, and session control statements dynamically. See Chapter 7, Performing SQL Operations with Native Dynamic SQL. Data Manipulation. To manipulate Oracle data you can include DML operations, such as INSERT, UPDATE, and DELETE statements, directly in PLSQL programs, without any special notation, as shown in Example 6 1. You can also include the SQL COMMIT statement directly in a PLSQL program see Overview of Transaction Processing in PLSQL. See also COMMIT in the Oracle Database SQL Reference. Example 6 1 Data Manipulation With PLSQL. CREATE TABLE employeestemp AS SELECT employeeid, firstname, lastname. FROM employees. empid employeestemp. TYPE. empfirstname employeestemp. TYPE. emplastname employeestemp. TYPE. INSERT INTO employeestemp VALUES2. Bob, Henry. UPDATE employeestemp SET firstname Robert WHERE employeeid 2. DELETE FROM employeestemp WHERE employeeid 2. RETURNING firstname, lastname INTO empfirstname, emplastname. DBMSOUTPUT. PUTLINE empfirstname emplastname. To find out how many rows are affected by DML statements, you can check the value of SQLROWCOUNT as shown in Example 6 2. Example 6 2 Checking SQLROWCOUNT After an UPDATE. CREATE TABLE employeestemp AS SELECT FROM employees. UPDATE employeestemp SET salary salary 1. WHERE salary lt 5. DBMSOUTPUT. PUTLINEUpdated SQLROWCOUNT salaries. Wherever you would use literal values, or bind variables in some other programming language, you can directly substitute PLSQL variables as shown in Example 6 3. Example 6 3 Substituting PLSQL Variables. CREATE TABLE employeestemp AS SELECT firstname, lastname FROM employees. VARCHAR22. 0 myfirstname. VARCHAR22. 5 mylastname. INSERT INTO employeestemp VALUESx, y. UPDATE employeestemp SET lastname x WHERE firstname y. DELETE FROM employeestemp WHERE firstname x. With this notation, you can use variables in place of values in the WHERE clause. BR6LX.jpg' alt='Update Using Multiple Tables Sql Statements' title='Update Using Multiple Tables Sql Statements' />SQL Server 2005 introduces a new TSQL feature that allows you to retrieve data affected by insertupdatedelete statements easily. This is achieved by the. TransactSQL Syntax Conventions. Syntax SQL Server Syntax Trigger on an INSERT, UPDATE, or DELETE statement to a table or view DML Trigger CREATE OR ALTER. Use SQL source member types e. SQLRPG, SQLRPGLE, SQLCBL, SQLCBLLE Prompting wont work without SQL member type You can prompt SQL statements in SEU. The MERGE statement basically works as separate insert, update, and delete statements all within the same statement. You specify a Source record set and a Target. My company has a number of SQL installation scripts that build a fresh copy of our database. Each script relates to a specific SQL task. One script builds the. Im using SQL Server and trying to use SQL to update multiple tables at once with one query The following query update table1 set A. ORGNAME ORGNAME, B. REFNAME. To use variables in place of table names, column names, and so on, requires the EXECUTE IMMEDIATE statement that is explained in Using the EXECUTE IMMEDIATE Statement in PLSQL. For information on the use of PLSQL records with SQL to update and insert data, see Inserting PLSQL Records into the Database and Updating the Database with PLSQL Record Values. For additional information on assigning values to PLSQL variables, see Assigning a SQL Query Result to a PLSQL Variable. Note. When issuing a data manipulation DML statement in PLSQL, there are some situations when the value of a variable is undefined after the statement is executed. These include. If a FETCH or SELECT statement raises any exception, then the values of the define variables after that statement are undefined. If a DML statement affects zero rows, the values of the OUT binds after the DML executes are undefined. This does not apply to a BULK or multirow operation. Transaction Control. Oracle is transaction oriented that is, Oracle uses transactions to ensure data integrity. A transaction is a series of SQL data manipulation statements that does a logical unit of work. For example, two UPDATE statements might credit one bank account and debit another. It is important not to allow one operation to succeed while the other fails. At the end of a transaction that makes database changes, Oracle makes all the changes permanent or undoes them all. If your program fails in the middle of a transaction, Oracle detects the error and rolls back the transaction, restoring the database to its former state. You use the COMMIT, ROLLBACK, SAVEPOINT, and SETTRANSACTION commands to control transactions. COMMIT makes permanent any database changes made during the current transaction. ROLLBACK ends the current transaction and undoes any changes made since the transaction began. SAVEPOINT marks the current point in the processing of a transaction. Used with ROLLBACK, SAVEPOINT undoes part of a transaction. SETTRANSACTION sets transaction properties such as read write access and isolation level. See Overview of Transaction Processing in PLSQL. SQL Functions. Example 6 4 shows some queries that call SQL functions. Example 6 4 Calling the SQL COUNT Function in PLSQL. NUMBER. empcount NUMBER. SELECT COUNTDISTINCT jobid INTO jobcount FROM employees. SELECT COUNT INTO empcount FROM employees. SQL Pseudocolumns. PLSQL recognizes the SQL pseudocolumns CURRVAL, LEVEL, NEXTVAL, ROWID, and ROWNUM. However, there are limitations on the use of pseudocolumns, including the restriction on the use of some pseudocolumns in assignments or conditional tests. For additional information, including restrictions, on the use of SQL pseudocolumns, see Oracle Database SQL Reference. CURRVAL and NEXTVALA sequence is a schema object that generates sequential numbers. When you create a sequence, you can specify its initial value and an increment. CURRVAL returns the current value in a specified sequence. Before you can reference CURRVAL in a session, you must use NEXTVAL to generate a number. A reference to NEXTVAL stores the current sequence number in CURRVAL. NEXTVAL increments the sequence and returns the next value. To get the current or next value in a sequence, use dot notation sequencename. CURRVALsequencename. NEXTVALEach time you reference the NEXTVAL value of a sequence, the sequence is incremented immediately and permanently, whether you commit or roll back the transaction. After creating a sequence, you can use it to generate unique sequence numbers for transaction processing. You can use CURRVAL and NEXTVAL only in a SELECT list, the VALUES clause, and the SET clause. Example 6 5 shows how to generate a new sequence number and refer to that same number in more than one statement. Example 6 5 Using CURRVAL and NEXTVAL. CREATE TABLE employeestemp AS SELECT employeeid, firstname, lastname. FROM employees. CREATE TABLE employeestemp. AS SELECT employeeid, firstname, lastname. FROM employees. seqvalue NUMBER. Display initial value of NEXTVAL. This is invalid seqvalue employeesseq. NEXTVAL. SELECT employeesseq. NEXTVAL INTO seqvalue FROM dual. DBMSOUTPUT. PUTLINE Initial sequence value TOCHARseqvalue. The NEXTVAL value is the same no matter what table you select from. You usually use NEXTVAL to create unique numbers when inserting data. INSERT INTO employeestemp VALUES employeesseq. NEXTVAL, Lynette, Smith. If you need to store the same value somewhere else, you use CURRVAL. INSERT INTO employeestemp. VALUES employeesseq. CURRVAL, Morgan, Smith. Because NEXTVAL values might be referenced by different users and. NEXTVAL values might not be stored in the. The following uses the stored value of the CURRVAL in seqvalue to specify. CURRVAL or NEXTVAL cannot used in a WHERE clause. CREATE TRIGGER Transact SQL Microsoft Docs. THIS TOPIC APPLIES TO SQL Server starting with 2. Azure SQL Database. Azure SQL Data Warehouse Parallel Data Warehouse Creates a DML, DDL, or logon trigger. A trigger is a special kind of stored procedure that automatically executes when an event occurs in the database server. DML triggers execute when a user tries to modify data through a data manipulation language DML event. DML events are INSERT, UPDATE, or DELETE statements on a table or view. These triggers fire when any valid event is fired, regardless of whether or not any table rows are affected. For more information, see DML Triggers. DDL triggers execute in response to a variety of data definition language DDL events. These events primarily correspond to Transact SQL CREATE, ALTER, and DROP statements, and certain system stored procedures that perform DDL like operations. Logon triggers fire in response to the LOGON event that is raised when a user sessions is being established. Triggers can be created directly from Transact SQL statements or from methods of assemblies that are created in the Microsoft. NET Framework common language runtime CLR and uploaded to an instance of SQL Server. SQL Server allows for creating multiple triggers for any specific statement. Important Malicious code inside triggers can run under escalated privileges. For more information on how to mitigate this threat, see Manage Trigger Security. Note The integration of. NET Framework CLR into SQL Server is discussed in this topic. CLR integration does not apply to Azure SQL Database. Transact SQL Syntax Conventions. Syntax SQL Server Syntax. Trigger on an INSERT, UPDATE, or DELETE statement to a table or view DML Trigger. CREATE OR ALTER TRIGGER schemaname. ON table view. WITH lt dmltriggeroption. FOR AFTER INSTEAD OF. INSERT, UPDATE, DELETE. WITH APPEND. NOT FOR REPLICATION. AS sqlstatement. EXTERNAL NAME lt method specifier. ENCRYPTION. EXECUTE AS Clause. SQL Server Syntax. Trigger on an INSERT, UPDATE, or DELETE statement to a. DML Trigger on memory optimized tables. CREATE OR ALTER TRIGGER schemaname. ON table. WITH lt dmltriggeroption. FOR AFTER. INSERT, UPDATE, DELETE. AS sqlstatement. NATIVECOMPILATION. SCHEMABINDING. EXECUTE AS Clause. Trigger on a CREATE, ALTER, DROP, GRANT, DENY. REVOKE or UPDATE statement DDL Trigger. CREATE OR ALTER TRIGGER triggername. ON ALL SERVER DATABASE. WITH lt ddltriggeroption. FOR AFTER eventtype eventgroup. AS sqlstatement. EXTERNAL NAME lt method specifier. ENCRYPTION. EXECUTE AS Clause. Trigger on a LOGON event Logon Trigger. CREATE OR ALTER TRIGGER triggername. ON ALL SERVER. WITH lt logontriggeroption. FOR AFTER LOGON. AS sqlstatement. EXTERNAL NAME lt method specifier. ENCRYPTION. EXECUTE AS Clause. Syntax Windows Azure SQL Database Syntax. Trigger on an INSERT, UPDATE, or DELETE statement to a table or view DML Trigger. CREATE OR ALTER TRIGGER schemaname. ON table view. WITH lt dmltriggeroption. FOR AFTER INSTEAD OF. INSERT, UPDATE, DELETE. AS sqlstatement. EXECUTE AS Clause. Windows Azure SQL Database Syntax. Trigger on a CREATE, ALTER, DROP, GRANT, DENY. REVOKE, or UPDATE STATISTICS statement DDL Trigger. CREATE OR ALTER TRIGGER triggername. ON DATABASE. WITH lt ddltriggeroption. FOR AFTER eventtype eventgroup. AS sqlstatement. EXECUTE AS Clause. Arguments. OR ALTERApplies to Azure SQL Database, SQL Server starting with SQL Server 2. SP1. Conditionally alters the trigger only if it already exists. Is the name of the schema to which a DML trigger belongs. DML triggers are scoped to the schema of the table or view on which they are created. DDL or logon triggers. Is the name of the trigger. A triggername must comply with the rules for identifiers, except that triggername cannot start with or. Is the table or view on which the DML trigger is executed and is sometimes referred to as the trigger table or trigger view. Specifying the fully qualified name of the table or view is optional. A view can be referenced only by an INSTEAD OF trigger. DML triggers cannot be defined on local or global temporary tables. DATABASEApplies the scope of a DDL trigger to the current database. If specified, the trigger fires whenever eventtype or eventgroup occurs in the current database. ALL SERVERApplies to SQL Server 2. SQL Server 2. 01. Applies the scope of a DDL or logon trigger to the current server. If specified, the trigger fires whenever eventtype or eventgroup occurs anywhere in the current server. WITH ENCRYPTIONApplies to SQL Server 2. SQL Server 2. 01. Obfuscates the text of the CREATE TRIGGER statement. Using WITH ENCRYPTION prevents the trigger from being published as part of SQL Server replication. WITH ENCRYPTION cannot be specified for CLR triggers. EXECUTE ASSpecifies the security context under which the trigger is executed. Enables you to control which user account the instance of SQL Server uses to validate permissions on any database objects that are referenced by the trigger. This option is required for triggers on memory optimized tables. For more information, see. EXECUTE AS Clause Transact SQL. NATIVECOMPILATIONIndicates that the trigger is natively compiled. This option is required for triggers on memory optimized tables. SCHEMABINDINGEnsures that tables that are referenced by a trigger cannot be dropped or altered. This option is required for triggers on memory optimized tables and is not supported for triggers on traditional tables. FOR AFTERAFTER specifies that the DML trigger is fired only when all operations specified in the triggering SQL statement have executed successfully. All referential cascade actions and constraint checks also must succeed before this trigger fires. AFTER is the default when FOR is the only keyword specified. AFTER triggers cannot be defined on views. INSTEAD OFSpecifies that the DML trigger is executed instead of the triggering SQL statement, therefore, overriding the actions of the triggering statements. INSTEAD OF cannot be specified for DDL or logon triggers. At most, one INSTEAD OF trigger per INSERT, UPDATE, or DELETE statement can be defined on a table or view. However, you can define views on views where each view has its own INSTEAD OF trigger. INSTEAD OF triggers are not allowed on updatable views that use WITH CHECK OPTION. SQL Server raises an error when an INSTEAD OF trigger is added to an updatable view WITH CHECK OPTION specified. Cda In Mp3 Konvertieren Freeware Download. The user must remove that option by using ALTER VIEW before defining the INSTEAD OF trigger. DELETE, INSERT, UPDATE Specifies the data modification statements that activate the DML trigger when it is tried against this table or view. At least one option must be specified. Any combination of these options in any order is allowed in the trigger definition. For INSTEAD OF triggers, the DELETE option is not allowed on tables that have a referential relationship specifying a cascade action ON DELETE. Similarly, the UPDATE option is not allowed on tables that have a referential relationship specifying a cascade action ON UPDATE. WITH APPENDApplies to SQL Server 2. SQL Server 2. 00.