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Dynamically merge and export data to EXCEL and dynamically export excel
Recently, I have been dealing with the problem of dynamic data merging and exporting EXCEL. I have written a demo record and hope that Boyou who have encountered the same problem can solve it smoothly; the demo download link will be provided later.
(VS2012, ASP. NET)
I. mainly solves the foll
Tags: into ret upd print from Oracl common insertion ideasIn the development we often encounter such a scene, column, such as user modification simple personal basic information, this time need to determine whether the user's basic information exists, if the first entry does not exist in the table insert a message, if there is the Update table information.To achieve this kind of scenario is very simple, our
Mysql uses group_concat () to merge multiple rows of data into one row, and mysqlgroup_concat
Assume that two tables a, B, and B are associated with table a through the field id, and table a and table B are one-to-many relationships. Assume that
Today, we encountered a situation where we read the information of several customers meeting condition 1 from a data table, read the information of several customers meeting condition 2, and finally display the information. because the structure of the customer information of the first and second data is identical, it is better to
To solve the pressure on a single server, the database and sub-server are deployed, but the table data synchronization originally implemented by the trigger cannot be achieved. Because the boss of the Director is not allowed to start the distributed transaction (MSDTC), I do not want to copy and subscribe to a few thousand lines of basic data. Therefore, we decid
are a number of different implementations of the hash table, and what I'll explain next is the most commonly used method-the zipper method, which we can understand as "arrays of linked lists"I use Java to achieve a hashmap, of course, this is relatively simple point, but can explain the approximate principle, the change of function basically hasIndex=hashcode (Key) =key%16Hash algorithm a lot, below I use the Java comes with, of course you can also
Merge data with SQL statements (original)
There is a table:Depid staffname----------------------101 aaaaa101 BBBB101 cccccc202 dddddd202 eee202 fff303 ggggg
Table Description: depid is the department ID and staffname is the employee name. Of course, a department has more than 0 .. n employees.
How can I combine the above tables with SQL statements.Depid staf
unmodified (Delta.id is NULL), the value of the base table is directly used, otherwise the data of the delta tables is directly usedFinally, we get the HQL statement we want:Select COALESCE (base. ID, Delta. ID ),if(delta. IDjoin Delta on base. id = Delta. ID where (delta. ID is NULL and base. ID is not NUll) OR (delta. ID is not NULL and base. ID is not NUll) OR (delta. ID is not NULL and base. ID is N
following error:ORA-01427: Single-line subquery returns multiple rows3. Through the above analysis, simple UPDATE statements do not solve the abnormal situation encountered. So we can use the merge as follows:
Merge into table1
using table2 in
(Table1.idd = Table2.idd) When
matched then
update set Table1.val = Table2.valAlthough can solve the E1 situation, but encountered E3 situation, still error, as fol
Label: update data for another table with data from one table in Oracle Category: Sql/plsql2012-05-04 15:49 4153 People read Comments (1) favorite reports OraclemergesubqueryinsertnullThere are two tables that update Val in the table TAB1 with the ID value in the same ro
MERGE into Table_onlineUSING Table_excelOn Table_online. [Key_o] = Table_excel. [Key_e]When matchedThen UPDATE SET table_online. [Merchant, store name, store area, store address, merchant category] = Table_excel. [Merchant, store name, store area, store address, merchant category]--updateWhen not matchedThen INSERT VALUES (table_excel.[ Merchant, store name, store area, store address, Merchant category])--insertWhen not matched by SOURCEThen DELETE; -
: Unable to get a stable set of rows in the source table
On the basis of 3, the restriction condition is added;Merge into Table1Using (select T.idd, max (T.val) m from table2 T Group by T.idd) table2On (Table1.idd = Table2.idd)When matched thenUpdate Set table1.val = TABLE2.M
The above method constructs a new table2,group by IDD after using, but must deal with Val, if it is a
statement, the above method, tells us user18991 this user's message is recorded in message_10 this table, user34523 This user's message is recorded in the Message_13 table, when read, as long as the reading from the respective tables on the line Disadvantage: When a rule is determined, breaking this rule will be very troublesome, the above example, I use the hash algorithm is CRC32, if I do not want to use
, the above method, tells us user18991 this user's message is recorded in message_10 this table, user34523 This user's message is recorded in the Message_13 table, when read, as long as the reading from the respective tables on the lineDisadvantage: When a rule is determined, breaking this rule will be very troublesome, the above example, I use the hash algorithm is CRC32, if I do not want to use this algor
INTEGER not null, stut_totalperiod INTEGER not null, stut_lasttime DATE not null, stut_totalmileage INTEGER not null, error_totalperiod INTEGER default 0 not null, error_totalmileage INTEGER default 0 not null, stut_nums INTEGER default 0 not null according to the ID card (stu_idcard), project number (stus_sinfoid) in Table) to accumulate stus_totalmileage. Stut_totalmileage in the column value corresponding to t
Select Goods_id,goods_type,goods_name,in_buy_price,round (SUM (in_total_price)/sum (In_amount), 2), COUNT (*) from In_ Warehouse_detail GROUP BY Goods_id,goods_type,goods_name ORDER by Goods_id,goods_type,goods_nameThe query results are as follows:Another association table "GOODS_ID Association of GOODS_ID and In_warehouse_detail tables through the goods table"Select from goodsWant to achieve the effect① u
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