INSERT, UPDATE and DELETE Statements in MySQL

Q

Where to find answers to frequently asked questions on INSERT, UPDATE and DELETE Statements in MySQL?

✍: FYIcenter.com

A

Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on INSERT, UPDATE and DELETE Statements in MySQL. Clear answers are provided with tutorial exercises on inserting and updating data rows; inserting and updating with subqueries; deleting data rows.

What Are DML Statements in MySQL

Creating a Test Table in MySQL

Inserting a New Row into a Table in MySQL

Using Column Default Values in MySQL

Omitting Columns in INSERT Statements in MySQL

Violation of Unique Value Constraint in MySQL

Insert Multiple Rows with 1 INSERT Statement in MySQL

Updating Values in a Table in MySQL

Update Column Values on Multiple Rows in MySQL

Use Existing Column Values in the SET Clause in MySQL

Order of Columns in the SET Clause in MySQL

UPDATE Using Data from Other Tables in MySQL

UPDATE with Subquery Returning No Rows in MySQL

Error: Subquery Returns More than 1 Row in MySQL

Deleting an Existing Row from a Table in MySQL

Deleting Multiple Rows from a Table in MySQL

Deleting All Rows in a Table in MySQL

Please note that all answers and tutorials are based on MySQL 5.0. Tutorial exercises should be executed with "mysql" or other MySQL client programs. It is also assumed that you have a MySQL user account and a predefined database with enough privileges.

Some sample scripts requires database tables created by other samples in the beginning of the collection.

⇒ What Are DML Statements in MySQL

⇐ Drop an Existing View in MySQL

⇑⇑ MySQL Database Tutorials

2018-01-24, 3022👍, 0💬

Omitting Columns in INSERT Statements in MySQL
How To Omit Columns with Default Values in INSERT Statement in MySQL? If you don't want to specify values for columns that have default values, or you want to specify values to columns in an order different than how they are defined, you can provide a column list in the INSERT statement. If a column... 2018-01-16, 1384👍, 0💬

Using Column Default Values in MySQL
How To Specify Default Values in INSERT Statement in MySQL? If a column is defined with a default value in a table, you can use the key word DEFAULT in the INSERT statement to take the default value for that column. The following tutorial exercise gives a good example: mysql> INSERT INTO fyi_... 2018-01-16, 1374👍, 0💬

Show All Indexes of a given Table in MySQL
How To Get a List of Indexes of a Given Table in MySQL? If you want to see the index you have just created for an existing table, you can use the "SHOW INDEX FROM tableName" command to get a list of all indexes in a given table. The tutorial script below shows you a nice example: mysql> SHOW ... 2018-02-14, 1338👍, 0💬

Drop an Existing Index in MySQL
How To Drop an Existing Index in MySQL? If you don't need an existing index any more, you should delete it with the "DROP INDEX indexName ON tableName" statement. Here is an example SQL script: mysql> DROP INDEX tip_subject ON tip; Query OK, 0 rows affected (0.13 sec) Records: 0 Duplicates: 0... 2018-02-14, 1303👍, 0💬

What Are DML Statements in MySQL
What Are DML Statements in MySQL? DML (Data Manipulation Language) statements are statements to change data values in database tables. The are 3 primary DML statements: INSERT - Inserting new rows into database tables. UPDATE - Updating existing rows in database tables . DELETE - Deleting existing r... 2018-01-24, 1283👍, 0💬

Inserting a New Row into a Table in MySQL
How To Insert a New Row into a Table in MySQL? To insert a new row into a table, you should use the INSERT INTO statement with values specified for all columns as shown in the following example: mysql> INSERT INTO fyi_links VALUES (101, 'dev.fyicenter.com', NULL, 0, '2006-04-30'); Query OK, 1... 2018-01-16, 1253👍, 0💬

Drop an Existing View in MySQL
How To Drop an Existing View in MySQL? If you have an existing view, and you don't want it anymore, you can delete it by using the "DROP VIEW viewName" statement as shown in the following script: mysql> DROP VIEW faqComment; Query OK, 0 rows affected (0.00 sec) mysql> SELECT * FROM faq... 2018-01-24, 1234👍, 0💬

Create an Index for a Given Table in MySQL
How To Create an Index for a Given Table in MySQL? If you have a table with a lots of rows, and you know that one of the columns will be used often as a search criteria, you can add an index for that column to improve the search performance. To add an index, you can use the "CREATE INDEX" statement ... 2018-02-14, 1223👍, 0💬

Creating a Test Table in MySQL
How To Create a Testing Table in MySQL? If you want to practice DML statements, like INSERT, UPDATE and DELETE, you should create a testing table. The tutorial exercise shows you a good example: mysql> CREATE TABLE fyi_links (id INTEGER PRIMARY KEY, url VARCHAR(80) NOT NULL, notes VARCHAR(102... 2018-01-24, 1199👍, 0💬

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