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duplicate data, use the union ALL command. UNION duplicate data is only shown once to delete duplicate data (equivalent to executing distinct)UNION all data displays, with better execution efficiency, regardless of whether duplicate data is not deduplicated2. Intersection (INTERSECT)Oracle provides INTERSECT commands similar to union, and also handles the results of two SQL statements. The difference is that the union command is conceptually an OR operator.Done, data is selected (and set) whene

main function of the Oracle analysis function: To take the first few, or the last few "sample" table content as follows: Name | seqno | Descriptiona | 1 | TestA | 2 | TestA | 3 | TestA | 4 | Testb | 1 | Testb | 2 | Testb | 3 | Testb | 4 | TESTC | 1 | TESTC | 2 | TESTC | 3 | TESTC | 4 | Test I want to have an SQL statement, the result of the search is a | 1 | Tes

result of this lookup is a branch of the tree that starts with that node.4. Use levelIn a table with a tree structure, each row of data is a node in the tree structure, and each row of records can have a layer number because the nodes are in different hierarchical locations. The layer number is determined by the distance between the node and the root node. The starting root node is always 1, the child node of the root node is 2, and so on, regardless

;public class Person {Personuionpkid uionpkid = new Personuionpkid ();private int age;Private String sex;Private String job;Public Personuionpkid Getuionpkid () {return uionpkid;}public void Setuionpkid (Personuionpkid uionpkid) {This.uionpkid = Uionpkid;}public int getage () {return age;}public void Setage (int.) {This.age = age;}Public String Getsex () {return sex;}public void Setsex (String sex) {This.sex = sex;}Public String Getjob () {return job;}public void Setjob (String job) {This.job =