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mysql

  1. Richard To
    Thread

    How to Tune SQL Statement with IN List Bind Variables for MySQL?

    The following is an example shows a SQL statement with a variable on the IN List operator. The SQL retrieve records from EMPLOYEE table that...
    Thread by: Richard To, Dec 10, 2020, 0 replies, in forum: MySQL
  2. Richard To
    Thread

    How to Tune Delete SQL statement with subqueries for MySQL?

    The following is an example shows a DELETE SQL statement with subquery. The SQL delete records from emp_subsidiary that should satisfy with three...
    Thread by: Richard To, Nov 23, 2020, 0 replies, in forum: MySQL
  3. kost36
    Thread

    Group_concat into group_concat with two different separators

    I use the follown as one movie's page SELECT `mt_films`.`Title1` AS `Title1`, GROUP_CONCAT(DISTINCT `t_idiotita`.`idiotita`,...
    Thread by: kost36, Nov 17, 2020, 3 replies, in forum: MySQL
  4. Richard To
    Thread

    How to Tune MySQL UPDATE SQL statement with IN subquery II?

    I showed you how to tune an Update statement with a simple subquery in my last blog, a more complex update statement will be discussed in the...
    Thread by: Richard To, Oct 22, 2020, 0 replies, in forum: MySQL
  5. Richard To
    Thread

    How to tune “order by rand() limit 1” SQL statement ?

    There may be some business requirements that needs to retrieve only some rows from a table (or join tables) randomly. This kind of SQL is normally...
    Thread by: Richard To, Aug 6, 2020, 0 replies, in forum: MySQL
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