Mysql double where clause

MYSQL double WHERE clause not working with = and AND. I have a query, generated by DataMapper (an ORM for CodeIgniter) that is returning on one server, but not on another. Both databases are exactly the same.

The query works on servers with MYSQL versions 5. MySql query double WHERE clause - Stack. When to use single quotes, double quotes,. The WHERE clause works like an if condition in any programming language.

Here is the list of operators, which can be used with the. When used with the AND logical operator, all the criteria must be met. SQL requires single quotes around text values (most database systems will also allow double quotes). The SQL statement above would return all rows from the suppliers table where the state is California. If all columns used from the index are numeric, only the index tree is used to resolve the query.

Before each row is output, those that do not match the HAVING clause are skipped. These clauses may be used in two ways: as AND clauses or as OR. An operator is a special keyword used to join or change clauses within a WHERE clause.

It is also known as logical operators. Multiple join and Where clause. The LEFT JOIN allows you to query data from two or more tables.

Similar to the INNER JOIN clause , the LEFT JOIN is an optional clause of the SELECT statement, which appears immediately after the FROM clause. SQL WHERE clause is used to restrict the number of rows affected by a SELECT, UPDATE or DELETE query. This is the third in a series of articles about subqueries. In this article we discuss subqueries in the WHERE clause. Other articles discuss their uses in other clauses.

GROUP BY clause is not sorted. The IN operator allows you to specify multiple values in a WHERE clause. Prepared statement with multiple values in WHERE clause.

The last example is a double-nested NOT EXISTS query. That is, it has a NOT EXISTS clause within a NOT EXISTS clause. Formally, it the question “ does a city exist with a store that is not in Stores ”? But it is easier to say that a nested NOT EXISTS the question “ is x TRUE for all y? MySQL Forums Forum List PHP. The fields used are needed and has_been_read.

Is it possible to write stored procedures where you pass the where clause as a parameter, because I would like to sometimes only compare one field other times several fields. I want to take customized date and time value in a variable then i want to use it in where clause as a condition. For that what i did is, using select statments and inserting into variables respectivly.

When this attribute is omitted from the ORDER BY clause , the sort order is defaulted to ASC or ascending order. Essentially you will be taking the array, throwing it into a string with the correct query syntax and sending one query to mysql. The WHERE Clause Determines which rows of table are to be selected. Use a not equal () comparison operator in the WHERE clause to introduce the subquery 12.

The subquery can be nested inside a SELECT, INSERT, UPDATE, or DELETE statement or inside another subquery. Also see Row Subqueries, Subqueries with EXISTS or NOT EXISTS, Correlated Subqueries and Subqueries in the FROM Clause.