conn = DriverManager.getConnection(URL, USERNAME, PASSWORD);Stringsql="SELECT my_sequence.NEXTVAL FROM dual"; pstmt = conn.prepareStatement(sql); rs = pstmt.executeQuery();if(rs.next()) {longnextVal=rs.getLong(1); System.out.println("Next value of my_sequence: "+ nextVal); } }catch(SQ...
idbigint)--插入测试数据DECLARE@indexbigintSET@index=100000001WHILE(@index<100000005)begininsertINTO#test1(id)VALUES(NEXTvalueFORSeq_test)insertINTO#test2(id)VALUES(NEXTvalueFORSeq_test)SET@index=@index+1end--展示测试数据SELECT*FROM#test1SELECT*FROM#test2 结果如下图所示: 在可以看到,如果我们不指定...
SELECT MAX(DepartmentID) FROM Test.Department ; --使用下一个期望值(4)作为START WITH VALUE; CREATE SEQUENCE Test.DeptSeq AS smallint START WITH 4 INCREMENT BY 1 ; GO -- 为DepartmentID列添加一个默认值 ALTER TABLE Test.Department ADD CONSTRAINT DefSequence DEFAULT (NEXT VALUE FOR Test.DeptSeq...
在Oracle数据库中,可以通过以下SQL语句来查看数据库中的序列: ="hljs">="hljs-keyword">SELECTsequence_name ="hljs-keyword">FROMuser_sequences; 该查询将返回当前用户下所有的序列名称。如果想要查看所有用户的序列,可以使用以下SQL语句: ="hljs">="hljs-keyword">SELECTsequence_name ="hljs-keyword">FRO...
CREATE SEQUENCE Test.DecSeq AS decimal(3,0) START WITH 125 INCREMENT BY 25 MINVALUE 100 MAXVALUE 200 CYCLE CACHE 3 ; 1. 2. 3. 4. 5. 6. 7. 8. 二、使用序列号:NEXT VALUE FOR 执行以下语句可查看第一个值;START WITH 选项为 125。将该语句再执行三次,以返回 150、175 ...
GO CREATE SEQUENCE Test.CounterSeq AS INT START WITH 1 INCREMENT BY 1 ; GO ALTER TABLE Test.MyTable ADD DEFAULT N'AdvWorks_' + CAST(NEXT VALUE FOR Test.CounterSeq AS NVARCHAR(20)) FOR IDColumn; GO INSERT Test.MyTable (name) VALUES ('Larry') ; GO SELECT * FROM Test.My...
CREATE SEQUENCE SEQUENCE_NAME [START WITH {Initial_Value}] [INCREMENT BY {interval}]; {Initial_Value} is the starting value of the sequence, and {interval} is the interval between consecutive sequence numbers. Both [START WITH] and [INCREMENT BY] are optional fields. If they are not ...
在OVER 语句或 NEXT VALUE FOR 语句中使用时,允许将 SELECT 子句与 INSERT … SELECT … 函数一起使用。NEXT VALUE FOR不允许在 UPDATE 或MERGE 语句中使用 函数。NEXT VALUE FOR 如果另一个进程同时访问序列对象,则返回的编号可能会出现间断。元数据有关序列的信息,请查询 sys.sequences 目录视图。安全...
SELECTNEXTVALUEFORTest.DecSeq; 将该语句再执行三次,以返回 150、175 和 200。 再次执行该语句,以查看起始值如何循环回到MINVALUE选项值 100。 执行以下代码,以确认缓存大小并查看当前值。 SQL SELECTcache_size, current_valueFROMsys.sequencesWHEREname='DecSeq'; ...
SELECT current_value FROM sys.sequences WHERE name = 'Student_SEQ' 1. 2. sql server定义变量以及变量赋值 DECLARE @index VARCHAR(20),@Orderindex VARCHAR(20); select @index=next value for ENTITY_SEQ; select @Orderindex= 'R_'+rtrim(ltrim(right(cast('00000000'+rtrim(cast(@index as int))...