Mysql where and statement

This MySQL tutorial explains how to use the AND condition and the OR condition together in a MySQL query with syntax and examples. The MySQL AND condition and OR condition can be combined in a SELECT, INSERT, UPDATE, or DELETE statement. We have seen the SQL SELECT command to fetch data from a MySQL table.

Using this WHERE clause, we can specify a selection criteria to select the required records from a table. The SELECT statement returned all the from the queried database table. They are however, times when we want to restrict the query to a specified condition.

The SQL WHERE clause comes in handy in such situations. The basic syntax for the WHERE clause when used in a SELECT statement is as follows. Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question.

Provide details and share your research! Asking for help, clarification, or responding to other. SQL Select Statement with WHERE, AN OR. In MySQL , a predicate is a Boolean expression that evaluates to TRUE, FALSE, or UNKNOWN.

Any row from the table_name that causes the search_condition to evaluate to TRUE will be included in the final result set. Besides the SELECT statement , you can use the WHERE clause in the UPDATE or DELETE statement to specify which rows to update or delete. The examples use SELECT statements, but the same optimizations apply for WHERE clauses in DELETE and UPDATE statements.

Note Because work on the MySQL optimizer is ongoing, not all of the optimizations that MySQL performs are documented here. I recently needed to use an IF statment in a WHERE clause with MySQL. The MySQL WHERE Clause is used to restrict the number of records (or rows) returned by the SELECT Statement. It means, SELECT Statement will return the records only If the condition specified after the WHERE keyword is TRUE. Let me take on example to demonstrate the functionality of MySQL where.

But what if you need to drop to the command line? You make use of WHERE statements. This tool is used in MySQL queries to filter records so. This chapter describes the syntax for the SQL statements supported by MySQL.

The above statement selects all records from the actor table in the sakila database where the value of the first_name column is equal to nick (not case-sensitive). Without the WHERE clause, the statement would return all records in the table. Depending on the database, this could potentially be thousands or even millions of records. The OR operator instructs MySQL to retrieve rows that match either condition.

IF and ELSE control structure. We can use If and else control structure in two ways in MySQL. If and Else control structure works only inside of a procedure.

So if you are creating a procedure and you want to use if and else control structure in your stored procedure. When I have just CASE statement , it works. Can anyone shine some light on this? Can there only be conditional in the WHERE clause?

If so, alternative syntax would be awesome. Your help is greatly appreciated! SQL is a standard language for storing, manipulating and retrieving data in databases.