growing elderberry

access the Curval and Nextval properties of the sequence. Curval: Returns the current value of the sequence Nextval: first increment the value of the sequence, then return the sequence value The following SQL statement creates the Customers table, inserts two records, sets the ID and the value of the Name field at the time of insertion, where the value of the ID field comes from the customer_id_seq sequence. The last query customers the ID field in the table. CREATE TABLE Customers (ID int prim

PRIMARY KEY, product varchar (max)) GO--Inserting values into product TABLE. Insert to Product values (' screwdriver ') insert into product values (' hammer ') insert into s (product) values (' saw ') INSERT into product values (' shovel ') GO – Create a gap in the identity VALUES. DELETE Products WHERE Product = ' saw ' Go SELECT * FROM products go--attempt to inserts an explicit ID value of 3; --should return a warning. INSERT into products (ID, product) VALUES (3, "garden Shovel") GO-SET ide

Tags: table ble create sequence enc self-increment ICA detail val httpsOriginal: 77978316The first step is to create the sequence: The generic sequence name consists of the data table name + primary key field +SEQ (typically the primary key field is the self-increment field), as the following table is named T_certificate, and the primary key is C_certificateidCreate the sequence statement as follows:CREATE SEQUENCE T_certificate_c_certificateid_seqSTART with 1INCREMENT by 1NO MINVALUENO MAXVALUE

key? Is there a better solution? There must be: snowflake In fact, most projects can use Twitter's snowflake to generate primary keys, and the primary key generated by Snowflake is a primary key between self-growth and UUID (small storage space, fast, distributed, time series). It is said that snowflake can generate 260,000 IDs per second, up to 1024 nodes, and the team can use snowflake as the underlying database primary key tool class for team members. My own view is: for the project involve

Package Cn.baokx;import Java.sql.connection;import Java.sql.preparedstatement;import java.sql.resultset;import Java.sql.sqlexception;import Java.sql.statement;import Cn.baokx.db.databaseconnection0;public class Test1 {public static void Main (string[] args) {Connection conn = new DatabaseConnection0 (). getconnection (); PreparedStatement PST = NULL; ResultSet rs = null; String sql = "INSERT into DZ (date,time,s,w,deep,level,location)" + "VALUES (' 2014-01-01 ', ' 05:03:44 ', 25.6,122.4,260,6.2

starts counting again from 1.We just need to execute the following command before inserting the record:DBCC checkident (table name, reseed, 0)Execution of TRUNCATE TABLE can also be done, and high efficiency because:Using Delete will record each operation to the log, so the efficiency is low, TRUNCATE TABLE is one time, the efficiency is much faster.However, Truncate table has restrictions, such as that the identity column is a foreign key to another table, and the identity column is currently

Resetting the seed of SQL Server self-growing columnsTransferred from: http://hi.baidu.com/zbphot/item/41c55982c2d02dd05e0ec184If the data in the table is not available, use the following statement: TRUNCATE TABLEIf the statement in the table is also, use the following statement: DBCC checkident (table name, reseed, 1)DBCC checkident (' table_name ', noreseed) does not reset the current identity value.DBCC Checkident Returns a report that indicates th

Today, I have studied a little about the function of Automatically increasing textarea with input content. google has referenced some implementation methods, most of which rely on scrollHeight (not W3C standard, introduced by IE ), keyup event. It

Okay, first parent is a script. This is a child object, and the child object and other core objects of the Dir class have a reference concept in it. I have not found any analysis of this document. Come on, what's the essence? core? The dir that

-- Explore the reasons for the continuous growth of log files and solutions. Transaction log files are another important component of SQL Server (also known as data files. Each database has a transaction log file to record all transactions and the

I often feel that my colleagues in the United States have been doing very well for 6 or 7 years. looking at ourselves, we will be outnumbered. If you have some feelings, write them down first and then update them slowly: > They are cool people. What

Another year......Lens switching......Because of the outstanding performance of Mr. Wang, Mr. Wang is now a small project manager. Another book, reconstruction: ImprovingCode. SortedAlgorithmIt is also relatively stable, and sorting has become an

To teach you to use Photoshop to make an apple gradually filled with water full of GIF dynamic effect, mainly in the shape of tools and masks application, like the students may wish to follow do! This article finally provides the source file to

In the last article we talked about the database tradition of three kinds of paging methods and their pros and cons, and put forward a theoretical best pagination method, this article we will elaborate on this best paging method. One: Idea. When

Know the computer is a long time, contact with the computer in 1997 years. I was in the first grade of junior high school. Remember very clearly the teacher let learning Wubi typing (Wubi typing also generally not how), are playing computer above

Design believe that a lot of people like to see this comedy, I am very fond of, including the growth of the vicissitudes of life, you can find the footprints of your growth. is the path of programming growth not like this? This is where the story

To say that the most successful social shopping sharing site, of course, is the mushroom street and Beauty said, in this crevice, there are still many new stations have been born and fallen, but there is a "turn things" of the sharing station, but

Overview The _id field of MongoDB exists as a primary key at the top level of all documents, and _id must be unique and always have a unique constraint index. In addition to the unique constraint, you can use any value on the _id field in the

1, open the env_sky_shadow.ma scene file, if you complete the previous practice, you can also use your last completed saved files.　Delete the sphere. Select the lights, 3D Env_sky icon, and the 3D texture icon for the cloud. Select Display > Hide >

File:dynaform. Asp dynamically Growing form If Request ("Action") = "Submit The List" Then ' Show what was entered. Response.Write "here are the Items submitted:" Nitems = Request.Form ("Items"). Count For I = 1 to Nitems ' Show submitted