2 conditions in where clause mysql?
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['You can use one or more tables separated by a comma to include various conditions using a WHERE clause, but the WHERE clause is an optional part of the SELECT command.', 'You can specify any condition using the WHERE clause.', 'You can specify more than one condition using the AND or the OR operators.']
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The SQL ANY and ALL Operators The ANY and ALL operators are used with a WHERE or HAVING clause. The ANY operator returns true if any of the subquery values meet the condition. The ALL operator returns true if all of the subquery values meet the condition.
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['What is the difference between SQL and MySQL?', 'What are the different subsets of SQL?', 'What do you mean by DBMS? What are its different types?', 'What do you mean by table and field in SQL?', 'What are joins in SQL?', 'What is the difference between CHAR and VARCHAR2 datatype in SQL?', 'What is the Primary key?', 'What are Constraints?']
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A filter can be used to display all the data of a single table based on a specified condition. Altering the data displayed changes the original data of the table. A query can be used to display selected data from one or more tables based on a specified condition or no condition at all.
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Let's look at an example of how to use MySQL IS NULL in a SELECT statement: SELECT * FROM contacts WHERE last_name IS NULL; This MySQL IS NULL example will return all records from the contacts table where the last_name contains a NULL value.
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How do I check if a column is empty or null in MySQL? SELECT * FROM yourTableName WHERE yourSpecificColumnName IS NULL OR yourSpecificColumnName = ' '; The IS NULL constraint can be used whenever the column is empty and the symbol ( ' ') is used when there is empty value.
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You cannot use aggregate functions in a WHERE clause or in a JOIN condition. However, a SELECT statement with aggregate functions in its select list often includes a WHERE clause that restricts the rows to which the aggregate is applied.
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['SELECT statements to select the fields of data you want to extract.', 'WHERE clauses to filter data.', 'ORDER BY clauses to sort data.', 'GROUP BY clauses to group data together.', 'Using the HAVING clause the user can filter groups of data.']
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Codeigniter provide set class function for each mysql function like where clause, join etc. So same for where clause, they provide "$this->db->where($array);", so we can use easily. In this tutorial, you can see two way to add multiple where condition in your codeigniter application.
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In MySQL, you can use the DATEDIFF() function to find the difference between two dates. The way it works is, you provide two arguments (one for each date), and DATEDIFF() will return the number of days between the two dates.
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For example, with an AutoFilter, you can select two specific customers, and two products for those selected customers. With an Advanced Filter, you can create OR conditions between columns, such as Customer A OR Product B -- you can't do that in an AutoFilter!
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INNER JOIN ON vs WHERE clause The WHERE clause, what is done is that all records that match the WHERE condition are included in the result set but an INNER JOIN is that, data not matching the JOIN condition is excluded from the result set.
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Both USING and ON clauses can be used for equijoins and nonequijoins. A maximum of one pair of columns can be joined between two tables using the ON clause. The ON clause can be used to join tables on columns that have different names but compatible data types.
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['MySQL INNER JOIN (or sometimes called simple join)', 'MySQL LEFT OUTER JOIN (or sometimes called LEFT JOIN)', 'MySQL RIGHT OUTER JOIN (or sometimes called RIGHT JOIN)']
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['Prepare an SQL query with empty values as placeholders with either a question mark or a variable name with a colon preceding it for each value.', 'Bind values or variables to the placeholders.', 'Execute query simultaneously.']
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The WHERE clause can be used to exclude rows before dividing them into groups. The aggregate functions and columns used in the HAVING clause must be specified in the SELECT list of the query. The WHERE and HAVING clauses can be used in the same statement only if they are applied to different columns in the table.
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2) WHERE clause is used for filtering rows and it applies on each and every row, while HAVING clause is used to filter groups in SQL. 3) One syntax level difference between WHERE and HAVING clause is that, former is used before GROUP BY clause, while later is used after GROUP BY clause.