where-clause

问题 I am new to php and trying hard to learn its why you guys and gals need to Forgive me for asking a lot! Here is my question; I am trying to call a function with where clause multiple times, I have read allmost all posts and examples still didn't understand how to do it. I tought that An example will be more useful than any blurb I can write. Here is the function I am trying to create and use it multiple times : function getTable($tableName, $clause) { $stmt = $pdo->prepare("SELECT * FROM ".

问题 I am new to php and trying hard to learn its why you guys and gals need to Forgive me for asking a lot! Here is my question; I am trying to call a function with where clause multiple times, I have read allmost all posts and examples still didn't understand how to do it. I tought that An example will be more useful than any blurb I can write. Here is the function I am trying to create and use it multiple times : function getTable($tableName, $clause) { $stmt = $pdo->prepare("SELECT * FROM ".

问题 I have a relatively simple query joining two tables. The "Where" criteria can be expressed either in the join criteria or as a where clause. I'm wondering which is more efficient. Query is to find max sales for a salesman from the beginning of time until they were promoted. Case 1 select salesman.salesmanid, max(sales.quantity) from salesman inner join sales on salesman.salesmanid =sales.salesmanid and sales.salesdate < salesman.promotiondate group by salesman.salesmanid Case 2 select

问题 I am trying to make a query like this dynamic using variables in SQL Server. Original Query (returns results) select * from items where [key] in ('material', 'type') and value in ('nylon/latex', 'general purpose') New Query (returns empty set) declare @keys nvarchar(max) = 'material, type' declare @values nvarchar(max) = 'nylon/latex, general purpose' select * from items where [key] in (@keys) and value in (@values) How can I pass CSV data into these in clauses dynamically? 来源： https:/

问题 I was trying to understand the following code: def() ->commands if(deferred_passive_abilities != [], let [{ability: class passive_ability, creature: class creature}] items = []; let found = false; map(deferred_passive_abilities, if(cmd = null, add(items, [value]), [cmd, set(found, true)]) where cmd = value.ability.static_effect(me, value.creature)); if(found, set(deferred_passive_abilities, items); evaluate_deferred_passive_abilities(), set(deferred_passive_abilities, [])) ) Haskell appears

问题 We use python spark cassandra driver V3.0.0. from datastax When try to load data by using dataframe, the where clause doesn't work. However the CQL itself does work in Datastax DevCenter. The code looks like this dataf = sqlc.read.format("org.apache.spark.sql.cassandra")\ .options(table="tran_history", keyspace="test")\ .load()\ .where("usr_id='abc' log_ts >= maxtimeuuid('2016-02-01 10:09:26-0800')")\ .collect() It seems the driver doesn't recognize method maxtimeuuid ------------------Below

问题 I read about using the CASE expression inside the WHERE clause here: http://scottelkin.com/sql/using-a-case-statement-in-a-sql-where-clause/ I'm trying to use this to filter results from my select statement, based on a contract number which will be passed in by the user's application. My code currently throws an error of 'Invalid parameter' no matter what is passed in. I verified SELECT/FROM are working fine, as where as a WHERE clause without a CASE expression. Here is my code. WHERE (CASE

问题 I have an SQL question which may be basic to some but is confusing me. Here is an example of column names for a table 'Person': PersonalID, FirstName, LastName, Car, HairColour, FavDrink, FavFood Let's say that I input the row: 121312, Rayna, Pieterson, BMW123d, Brown, NULL, NULL Now I want to update the values for this person, but only if the new value is not null, Update: 121312, Rayna, Pieterson, NULL, Blonde, Fanta, NULL The new row needs to be: 121312, Rayna, Pieterson, BMW123d, Blonde,

问题 I am trying to display the records,order as in the where clause.. example: select name from table where name in ('Yaksha','Arun','Naveen'); It displays Arun,Naveen,Yaksha (alphabetical order) I want display it as same order i.e 'Yaksha''Arun','Naveen' how to display this... I am using oracle db. 回答1: Add this ORDER BY at the query's end: order by case name when 'Yaksha' then 1 when 'Arun' then 2 when 'Naveen' then 3 end (There's no other way to get that order. You need an ORDER BY to get a

问题 SELECT * FROM ScoresTable WHERE Score = (SELECT MAX(Score) FROM ScoresTable AS st WHERE st.Date = ScoresTable.Date) Is there a name to describe using a SELECT statement within a WHERE clause? Is this good/bad practice? Would this be a better alternative? SELECT ScoresTable.* FROM ScoresTable INNER JOIN (SELECT Date, MAX(Score) AS MaxScore FROM ScoresTable GROUP BY Date) SubQuery ON ScoresTable.Date = SubQuery.Date AND ScoresTable.Score = SubQuery.MaxScore It is far less elegant, but appears