DML Statements.pptx
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The document discusses the different types of DML statements including insert, update, and delete. The insert statement is used to add new records to a table. The update statement modifies existing records in a table. The delete statement removes records from a table. Examples are provided for each statement showing the required syntax and how to specify conditions to target specific records for the operation.
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DML Statements.pptx
- 1. DML Statements Presented By- M S Ritesh Contents: 1. Insert Statement 2. Update Statement 3. Delete Statement
- 2. Insert Statement The INSERT INTO statement is used to insert new records in a table. INSERT INTO Syntax: It is possible to write the INSERT INTO statement in two ways: 1. Specify both the column names and the values to be inserted: 2. If you are adding values for all the columns of the table, you do not need to specify the column names in the SQL query. However, make sure the order of the values is in the same order as the columns in the table. Here, the INSERT INTO syntax would be as follows:
- 3. Demo Table Consider the following customer table:
- 4. Insert Statement Example The following SQL statement inserts a new record in the "Customers" table: The CustomerID column is an auto-increment field and will be generated automatically when a new record is inserted into the table.
- 5. Insert Data Only in Specified Columns It is also possible to only insert data in specific columns. The following SQL statement will insert a new record, but only insert data in the "Customer Name", "City", and "Country" columns (Customer ID will be updated automatically):
- 6. Delete Statement The DELETE statement is used to delete existing records in a table. DELETE Syntax: Note: Be careful when deleting records in a table! Notice the WHERE clause in the DELETE statement. The WHERE clause specifies which record(s) should be deleted. If you omit the WHERE clause, all records in the table will be deleted! Consider the following customer table:
- 7. SQL DELETE Example The following SQL statement deletes the customer "Alfreds Futterkiste" from the "Customers" table: The "Customers" table will now look like this:
- 8. It is possible to delete all rows in a table without deleting the table. This means that the table structure, attributes, and indexes will be intact: The following SQL statement deletes all rows in the "Customers" table, without deleting the table:
- 9. Update Statement The UPDATE statement is used to modify the existing records in a table. UPDATE Syntax Note: Be careful when updating records in a table! Notice the WHERE clause in the UPDATE statement. The WHERE clause specifies which record(s) that should be updated. If you omit the WHERE clause, all records in the table will be updated! Consider the following customer table:
- 10. Update Statement Example The following SQL statement updates the first customer (CustomerID = 1) with a new contact person and a new city. The "Customers" table will now look like this:
- 11. UPDATE Multiple Records It is the WHERE clause that determines how many records will be updated. The following SQL statement will update the ContactName to "Juan" for all records where country is "Mexico": The "Customers" table will now look like this:
- 12. Be careful when updating records. If you omit the WHERE clause, ALL records will be updated! The above query will update all records in customer table. The "Customers" table will now look like this: