拼接sql語句
Ⅰ 多條sql語句如何拼接
SQL語句拼接一般使用【union all】和【union】
兩者的區別是:
【union all】:顯示多條語句里的全部記錄;
【union】:顯示多條語句里的不重復的記錄,也就是有DIstinct的功效;
【union all】示例:
select'2016-02-06'date_timeunionall
select'2016-02-14'unionall
select'2016-06-12'unionall
select'2016-09-18'unionall
select'2016-10-09'unionall
select'2016-10-09'
結果為6行
【union】示例:
select'2016-02-06'date_timeunionall
select'2016-02-14'unionall
select'2016-06-12'unionall
select'2016-09-18'unionall
select'2016-10-09'unionall
select'2016-10-09'
結果為5行
Ⅱ 新手:拼接sql語句求改帶參數的sql語句
string sql= "SELECT count(*) from Logs where UserName=@username and Passwrod=
@password「;
SqlConnection conn=new SqlConnection (constr);//constr是資料庫連接字元串,要自己寫的,
SqlCommand cmd=new SqlCommand(sql,conn);
SqlParameter p1 = new SqlParameter("@username", username);
SqlParameter p2 = new SqlParameter("@password", password);
cmd.Parameters.Add(p1);
cmd.Parameters.Add(p2);
//這樣就可以了,@username,@password是SQL中的命令參數,username,password是應用程序的參數
Ⅲ SQL語句拼接
在原來的基礎上加上一句
selectQ.*,
row_number()over(orderbya.viddesc)rn
fromtb_QuestionQinnerjoin(
selectTOP100PERCENTQuestionID,MAX(VoteNice)asVidfromtb_AnswerA
groupbyQuestionIDorderbyMAX(VoteNice))T
onQ.QuestionID=T.QuestionIDorderbyT.Vid
Ⅳ jdbc怎麼拼接sql語句
在jdbc中,有三種方式執行sql,分別是使用Statement(sql拼接),PreparedStatement(預編譯),還有一種CallableStatement(存儲過程),在這里我就不介紹CallableStatement了,我們來看看Statement與PreparedStatement的區別。
Ⅳ sql server 怎樣拼接sql語句
/*定義變數,然後賦值就可以拼接sql腳本了*/
declare@sqlvarchar(max)
set@sql='select*fromsysobjects'
set@sql=@sql+'wherextype=''u'''
exec(@sql)
Ⅵ 拼接SQL語句
sql語句拼接主要操作於條件增加刪除修改或查詢面給介紹條件查詢例:
既拼接sql語句度定用StringBuffer修飾用String
String name=request.getParameter("name");
String address=request.getParemeter("address");
StringBuffer sql = new StringBuffer();
sql.append("select * from Tuser as t where 1=1");
if(name!=null||!"".equals(name)){
sql.append(" and t.name like'%"+name+"%'");
}
if(address!=null||!"".equals(address)){
sql.append(" and t.address like'%"+address+"%'");
}
拼接sql語句說select * from Tuser as t where 1=1定執行面兩根據用戶數據參數選擇執行
我手寫啊沒復制明白明再問我明白給吧嘿嘿!
Ⅶ 兩個sql語句拼接
select m.khmc,m.djr,m.bfrq, m.bfr,m.bfmd,m.fkqk from formtable_main_32 m ,(
select id,mc,gjc from (select id,mc mc,ywgjz gjc from formtable_main_23 where cyfl = 4 union
select id,tzr mc,tzrxssjg gjc from formtable_main_23 where cyfl = 0 union
select id,Yfjsfzr mc,Yfxx gjc from formtable_main_23 where cyfl = 1 union
select id,Lshi mc,Lsuo gjc from formtable_main_23 where cyfl = 2 union
select a.id,Rczw mc,b.selectname gjc from formtable_main_23 a left join workflow_SelectItem b on a.Rchy = b.selectvalue where cyfl = 3 and fieldid = 6212) as tmp) tm where m.id=tm.id
Ⅷ java如何拼接sql語句
你咋不試試,
String columnStr;
String valueStr;
for(int i=0; i<columns.length; i++){
columnStr = "(" + columns[i] + ",";
valueStr = "'( \"" + value[i] + ",";
}
參考JAVA轉義字元。網路一下吧。你自己試試,我這里沒裝jdk,懶得弄了,准備休息了。
Ⅸ 如何實現sql語句的拼接
declare @sql varchar(500)
set @sql ='SELECT * FROM TABLE1'
set @sql = @sql + ' WHERE PRICE>20.00'
set @sql = @sql + ' AND COUNTS>5000'
set @sql = @sql + ' ORDER BY COUNTS DESC'
Ⅹ sql查詢語句怎麼拼接字元串
--1、在where的地方可以用case
select*
from表1
where欄位1=casewhen@欄位1>0then@欄位1end
--2、或者在賦值的時候做判斷用4個參數,你可以根據下面的寫法自己修改
@欄位1,@欄位2,@欄位3,@欄位
if@欄位1>0
begin
select@欄位=@欄位1
select*
from表1
where欄位1=@欄位
end
ifif@欄位1<0and@@欄位2>0
begin
select@欄位=@欄位2
select*
from表1
where欄位1=@欄位
end