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  • Case Statements versus coded if statements

    - by Eric
    What is more efficient - handling with case statements in sql or handling the same data using if statements in code. I'm asking because my colleague has a huge query that has many case statements. I advised her to take stress off of the DB by coding the case statements. I've found that it is more efficient...but why?

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  • MySQL only returning one result. Im Baffled.

    - by Tapha
    Here is te code: <?php //Starting session session_start(); //Includes mass includes containing all the files needed to execute the full script //Also shows homepage elements without customs require_once ('includes/mass.php'); $username = $_SESSION['username']; if (isset($username)) { //Query database for the users networths $sq_l = "SELECT * FROM user"; $sql_query_worth = mysql_query($sq_l); while ($row = mysql_fetch_assoc($sql_query_worth)) { $dbusername = $row['username']; } echo $dbusername; } ?>

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  • How can you remove a Criterion from a criteria?

    - by ChuckM
    Hello, For instance if I do something like: Criteria c = session.createCriteria(Book.class) .add(Expression.ge("release",reDate); .add(Expression.ge("price",price); .addOrder( Order.asc("date") ) .setFirstResult(0) .setMaxResults(10); c.list(); How can I use the same criteria instance, but remove (for example) the second criterion? I'm trying to build a dynamic query in which I'd like to let the user remove a filter, without the backend having to reconstruct the criteria from scratch. Thank you

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  • Better mode for do a select with group by

    - by Luca Romagnoli
    Hi i've wrote a query that works: SELECT `comments`.* FROM `comments` RIGHT JOIN (SELECT MAX( id ) AS id, core_id, topic_id FROM comments GROUP BY core_id, topic_id order by id desc) comm ON comm.id = comments.id LIMIT 10 I want know if is possible and how rewrite it for get better performance. thanks

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  • database assignment

    - by eric
    Hi, Given the following table: CREATE TABLE T1 (A INTEGER NOT NULL); CREATE TABLE T3 (A SMALLINT NOT NULL); INSERT T1 VALUES (32768.5); SELECT * FROM T1; INSERT T3 SELECT * FROM T1; SELECT * FROM T3; What is the output of above query? If any error occured please declare the line of it?Explain your answer!

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  • Create table with PHP and populate from MySQL

    - by typoknig
    Hi all, I am creating a table to display on a web page and that table is populated from data in a MySQL database. I am trying to do a couple of things that are making it difficult for me. First I am trying to have call the PHP code that exists in a separate file in HTML via JavaScript. I think I have that working right but I am not 100% sure (because the table will not display). I think it is working right because some of the code for the table (which is in the PHP file) displays in FireBug. Second I am trying to make it so the rows alternate colors for easy viewing too. My PHP code so far is below. The table does not display at all in any browser. $query = "SELECT * FROM employees"; $result = mysql_query($query); $num = mysql_num_rows($result); echo '<table>'; for ($i = 0; $i < $num; $i++){ $row = mysql_fetch_array($result); $id = $row['id']; $l_name = $row['l_name']; $f_name = $row['f_name']; $ssn = $row['ssn']; $class = (($i % 2) == 0) ? "table_odd_row" : "table_even_row"; echo "<tr>"; echo "<td class=" . $class . ">$wrap_id</td>"; echo "<td class=" . $class . ">$wrap_l_name</td>"; echo "<td class=" . $class . ">$wrap_f_name</td>"; echo "<td class=" . $class . ">$wrap_ssn</td>"; echo "</tr>"; } echo '</table>'; mysql_close($link); }

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  • what's wrong with this function?

    - by Joann
    function get_ibo_id() { if($registerquery = $this->conn->query("SELECT ibo_id FROM fasttrack WHERE count < 8 && flag = 1 ")){ $this->increase_count(); while ($row = $registerquery->fetch_assoc()) { return $row[ibo_id]; } } else return "No id"; } it always enters the if block even if the condition is not satisfied... going crazy

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  • how can i execute large mysql queries fast

    - by testkhan
    I have 4 mysql tables and have a single query with JOIN on multiple tables and I am requesting it via jquery ajax, but it takes to much long time from about 1-3 minutes while I want to execute them on average 2-5 seconds. is there any special way to execute the quries fast

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  • How to distinguish between the first and rest for duplicate records using sql ?

    - by Biswanath
    Hi, These are the input table and required output table. Input table ID Name ------------- 1 aaa 1 ababaa 2 bbbbbb 2 bcbcbccbc 2 bcdbcdbbbbb 3 ccccc Output table ID Name Ord ----------------------------- 1 aaa first 1 ababaa rest 2 bbbbbb first 2 bcbcbccbc rest 2 bcdbcdbbbbb rest 3 ccccc first First and Rest is based on the occurrence of an ID field. Is there a way to write a SQL query to achieve this ? P.S. - This question is somewhat similar to what I am looking for.

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  • Where am I going wrong with the count in Hql

    - by Bipul
    So I only want the count of the results not the results themselves therefore I am using count in hql. So, below is the query (int) Session.CreateQuery("select count(*) from TableName where Lhs=Rhs").UniqueResult(); But it is giving me the error Specified cast is not valid.. So, can any body tell me how to cast the count to int. Any help is very much appreciated.

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  • sql - getting the id from a row based on a group by

    - by user85116
    Table A tableAID tableBID grade Table B tableBID name description Table A links to Table b from the tableBID found in both tables. If I want to find the row in Table A, which has the highest grade, for each row in Table B, I would write my query like this: select max(grade) from TableA group by tableBID However, I don't just want the grade, I want the grade plus id of that row.

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  • Unknown Column In Where Clause

    - by Corpo
    I have a simple query: SELECT u_name AS user_name FROM users WHERE user_name = "john"; I get "Unknown Column 'user_name' in where clause". Can I not refer to 'user_name' in other parts of the statement even after select 'u_name as user_name'?

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  • Creating Simple desktop database application

    - by KoolKabin
    Hi guys, I am here to write a small database application that will be running in desktop (offline mode). I am using MSAccess 2007 as my database file and trying to write code in vb.net. I used to write the code vb6 an usually had global variables for storing database connection and executing every query from that. I am trying to upgrade myself from vb6 to vb.net. do i need to read some more simple starter books also?

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  • MSSQL. Compare columns in two tables.

    - by maxt3r
    Hi, i've recently done a migration from a really old version of some application to the current version and i faced some problems while migrating databases. I need a query that could help me to compare columns in two tables. I mean not the data in rows, i need to compare the columns itself to figure out, what changes in table structure i've missed.

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