update primary key sql

OrderID. Finally, update the Oderdetail table. However, to ensure data consistency, order and OrderDetail must be updated at the same time under transaction protection, which ensures that both tables are more successful at the same time. It is clear that they contradict each other. In addition, when we need to replicate data between multiple databases (SQL Server's data distribution, subscription mechanism

you set the OrderID field to a manual growth field, our program can be implemented by calling the stored procedure first, obtaining a OrderID, and then using this OrderID to populate the order table with the OrderDetail table, and then update the two tables under transaction protection. When you use a manual growth field as a primary key to replicate data betwee

group By status is this index useful?Key uses: Mainly to speed up the query.second, key and index differenceComment: I still foggy this part.Key is usually the index synonym. If the keyword attribute primary key is given in the column definition, then primary

(status,type,displayorder) Select * from Table Group by does the status,type,displayorder automatically use this index, Select * from Table Group by Status is this index useful? The answer is auto-indexed. Key uses: Mainly to speed up the query. second, key and index difference Key is usually the index synonym. If the keyword attribute

, MESSAGE VARCHAR (255) NOT NULL, PRIMARY KEY (ID) } The primary key generation policy for identity types in JPA is as follows: @GeneratedValue (strategy=generationtype.identity) @Column (name= "id") private long ID; Because the primary

group By status is this index useful?Key uses: Mainly to speed up the query.second, key and index differenceComment: I still foggy this part.Key is usually the index synonym. If the keyword attribute primary key is given in the column definition, then primary

group By status is this index useful?Key uses: Mainly to speed up the query.second, key and index differenceComment: I still foggy this part.Key is usually the index synonym. If the keyword attribute primary key is given in the column definition, then primary

Oracle version:Sql> select * from V$version; BANNER----------------------------------------------------------------Oracle9i Enterprise Edition Release 9.2.0.6.0-productionPl/sql Release 9.2.0.6.0-productionCORE 9.2.0.6.0 Production TNS for 32-bit windows:version 9.2.0.6.0-productionNlsrtl Version 9.2.0.6.0-production ***************************************************************** * When you create a primary