query-variables

问题 Is it possible to set/read variables from within the query? pseudo code: SELECT animal_name, @tallest_animal = (select top 1 height from animal order by height desc) as tallest, @smallest_animal = (select top 1 height from animal order by height asc) as smallest FROM animals WHERE height BETWEEN @smallest_animal AND @tallest_animal I know the result can be achieved by making the query different, my question's real use is too difficult to explain. It's Microsoft SQL Server in question. :) 回答1:

问题 Is it possible to set/read variables from within the query? pseudo code: SELECT animal_name, @tallest_animal = (select top 1 height from animal order by height desc) as tallest, @smallest_animal = (select top 1 height from animal order by height asc) as smallest FROM animals WHERE height BETWEEN @smallest_animal AND @tallest_animal I know the result can be achieved by making the query different, my question's real use is too difficult to explain. It's Microsoft SQL Server in question. :) 回答1:

问题 Is it possible to set/read variables from within the query? pseudo code: SELECT animal_name, @tallest_animal = (select top 1 height from animal order by height desc) as tallest, @smallest_animal = (select top 1 height from animal order by height asc) as smallest FROM animals WHERE height BETWEEN @smallest_animal AND @tallest_animal I know the result can be achieved by making the query different, my question's real use is too difficult to explain. It's Microsoft SQL Server in question. :) 回答1:

问题 Is it possible to set/read variables from within the query? pseudo code: SELECT animal_name, @tallest_animal = (select top 1 height from animal order by height desc) as tallest, @smallest_animal = (select top 1 height from animal order by height asc) as smallest FROM animals WHERE height BETWEEN @smallest_animal AND @tallest_animal I know the result can be achieved by making the query different, my question's real use is too difficult to explain. It's Microsoft SQL Server in question. :) 回答1:

问题 Is it possible to set/read variables from within the query? pseudo code: SELECT animal_name, @tallest_animal = (select top 1 height from animal order by height desc) as tallest, @smallest_animal = (select top 1 height from animal order by height asc) as smallest FROM animals WHERE height BETWEEN @smallest_animal AND @tallest_animal I know the result can be achieved by making the query different, my question's real use is too difficult to explain. It's Microsoft SQL Server in question. :) 回答1:

问题 How can I get a WooCommerce order by its number (instead of its ID)? I tried using wc_get_orders with custom args, like: wc_get_orders( array( 'number' => '1000' ) ); But it doesn't seem to work. Thanks! 回答1: Order numbers functionality is really enabled through a third party plugin in WooCommerce… Then in this case a new meta_key exist in wp_postmeta database table for shop_order WooCommerce post type which is _order_number . So this parameter doesn't exist by default when using wc_get

问题 I was playing around (out of interest) with retrieving a tree of nodes in a simple adjacency list with a recursive query using local variables. The solution i have so far is fun but i wonder (and this is my only question) why MySQL refuses to use any INDEX to optimize this query. Shouldn't MySQL be able to lookup the nearest child(s) by using an INDEX ? I'm curious why MySQL doesn't. Even when i use FORCE INDEX the execution plan doesn't change. This is the query so far, with 5 being the ID