華閱文章網英語介紹unionkingdom
* Protestant areas,they are usually loyalist and support the existing union with the United * you can choose to bless us in return bigger than you thought possible and we will see what is in the way of even more Union and Truth in our kingdom for us to * Kingdom of England was an independent state until 1 May 1707,when the Acts of Union resulted in a political union with the Kingdom of Scotland to create the Kingdom of Great * Podgorica Assembly voted for union of the people,declaring a joining into the Kingdom of * Protestant areas,they are usually loyalist and support the existing union with the United * Swan Kingdom holds the vibration of Divine Union in the new astrology that has been anchored upon earth late last year.7.A reduction in corporate tax in one part of the United Kingdom and not others may also fall foul of European Union state aid *n Trade Union for an extension of more than 30 years history of the procurement trading company,based in the United *,1st May 1707,was the day the Act of Union came into effect,joining England and Scotland to form the Kingdom of Great * current design (which is used as the national Flag of the United Kingdom) dates from the Union of Ireland and Great Britain in * 1800 Great Britain was united with Ireland through another Act of Union 1800 to become the United Kingdom of Great Britain and * fund's geographical scope comprises all European Union countries,with a focus on France,Germany,Italy,Spain and the United *ing with the kingdom of England,it was created by three acts of union:with Wales (1536),Scotland (1707),and Northern Ireland (1800).*n's Union Flag records in its name and fusion of three different emblems the growth of one kingdom out of the successive union of three * – Jordan and the European Union on December 3,2008 launched a project to boost the kingdom's efficiency in fighting terrorism and organized crime.。
SQL語句UNION指令是什么
UNION 指令的目的是將兩個 SQL 語句的結果合并起來。
從這個角度來看， UNION 跟 JOIN 有些許類似，因為這兩個指令都可以由多個表格中擷取資料。 UNION 的一個限制是兩個 SQL 語句所產生的欄位需要是同樣的資料種類。
另外，當我們用 UNION這個指令時，我們只會看到不同的資料值 （類似 SELECT DISTINCT）。 UNION 的語法如下： [SQL 語句 1] UNION [SQL 語句 2] 假設我們有以下的兩個表格 Store_Information 表格 store_namesalesdate Los Angeles$1500jan-05-1999 San Francisco$300jan-08-1999 Boston$700jan-08-1999 Internet Sales 表格 DateSales Jan-07-1999$250 Jan-10-1999$535 Jan-11-1999$320 Jan-12-1999$750 而我們要找出來所有有營業額 （sales） 的日子。
要達到這個目的，我們用以下的 SQL 語句： SELECT Date FROM Store_Information UNION SELECT Date FROM Internet_Sales 結果： Date Jan-05-1999 Jan-07-1999 Jan-08-1999 Jan-10-1999 Jan-11-1999 Jan-12-1999 有一點值得注意的是，如果我們在任何一個 SQL 語句 （或是兩句都一起） 用 "SELECT DISTINCT Date" 的話，那我們會得到完全一樣的結果。
SQL語句中：UNION與UNION ALL的區別
UNION用的比較多union all是直接連接，取到得是所有值，記錄可能有重復 union 是取唯一值，記錄沒有重復 1、UNION 的語法如下：
[SQL 語句 1]
UNION
[SQL 語句 2]
2、UNION ALL 的語法如下：
[SQL 語句 1]
UNION ALL
[SQL 語句 2]
效率：
UNION和UNION ALL關鍵字都是將兩個結果集合并為一個，但這兩者從使用和效率上來說都有所不同。
1、對重復結果的處理：UNION在進行表鏈接后會篩選掉重復的記錄，Union All不會去除重復記錄。
2、對排序的處理：Union將會按照字段的順序進行排序；UNION ALL只是簡單的將兩個結果合并后就返回。
從效率上說，UNION ALL 要比UNION快很多，所以，如果可以確認合并的兩個結果集中不包含重復數據且不需要排序時的話，那么就使用UNION ALL。
SQL語句中UNION排序問題
代碼改寫如下：
select a.輸出字段1, a.輸出字段2, a.輸出字段3, 。a.輸出字段n from
(select * ,1 as px from 表A where 軟件名稱 like '%迅雷%'
union
select * ,2 from 表A where 軟件簡介 like '%迅雷%') a order by *
如果不在意多出一個用于排序的字段“px”的話，代碼可簡化如下
select * ,1 as px from 表A where 軟件名稱 like '%迅雷%' order by 1
union
select * ,2 from 表A where 軟件簡介 like '%迅雷%'
***注意，因人為增加了一個排序用數字字段（第一個查詢用1，第二個用2）,UNION關鍵字的刪除兩個查詢之間重復數據的功能會不起作用，如果需要保持刪除重復記錄的能力，則需要使用DISTINC關鍵字，例如：
select distinct a.輸出字段1, a.輸出字段2, a.輸出字段3, 。a.輸出字段n from
(select * ,1 as px from 表A where 軟件名稱 like '%迅雷%'
union
select * ,2 from 表A where 軟件簡介 like '%迅雷%') a order by *
上機試一試吧
