oracle sql to char

If the field type in the table is char (1), Linq to SQL generates the properties of char (System.Char), as shown in the following figure Table Definition Generated entities 2. If you want to query the records of linecode== ' A ', you can define LINQ query statements like this var test1

Tags: fixed har char trim definition length take number requires VarThe length of the char type is immutable in SQL Server, and the length of the varchar is variable.When depositing data:If the data type is char, when a fixed length of a field is defined, if the length of the stored data is less than the length of

that the length of the corresponding length, and the variable length character data will not be filled with spaces, the exception is that the text storage is also variable length. (6) How do I use these types? If you are sure of the length of the stored data and do not pack in Chinese, you can choose the char type. If you are sure of the stored data length, but may include Chinese, you can choose the nchar type.

the efficiency of a varchar high. (4) Why use nvarchar? with n prefixes, n denotes Unicode characters, that is, all characters account for two bytes, Nchar,nvarchar Character, the English characters only need one byte storage is sufficient, but the Chinese character is numerous, requires two bytes of storage, English and Chinese characters are prone to confusion, the Unicode character set is to solve the problem of incompatible character sets, all of its characters are represented by two bytes,

a varchar high.(4) Why use nvarchar?with n prefixes, n denotes Unicode characters, that is, all characters account for two bytes, Nchar,nvarcharCharacter, the English characters only need one byte storage is sufficient, but the Chinese character is numerous, requires two bytes of storage, English and Chinese characters are prone to confusion, the Unicode character set is to solve the problem of incompatible character sets, all of its characters are represented by two bytes, That is, the English

Tags: des style blog color ar sp div on problemI did it. Access requires that the field's values be sorted, the field format is of type char, but the stored value is a number. Now you need to sort the field.Find the following two ways to record them.1, you can convert to int type reorderSelect * from Jzd orderbyconvert(intdescBut this method is not good in access because there is no convert function.So the final use of the 2nd clock method2, you can

Label:Ora-00932:inconsistent datatypes:expected number got CHAR00932.00000-"Inconsistent datatypes:expected%s got%s"1 Case 2when '0'then NVL (tx_cnt,0 )3 ELSE4END act_tx_cnt,TX_CNT is number type, which is the count after group byTOT_TX_CNT is VARCHAR2 (XX) typeTherefore, the above error message appears.Solution: Transform data to convert Number data to VACHAR2 (XX) type1 Case 2when'0'thenCAST(NVL (act_tx_cnt,0 asVARCHAR2(83ELSE4 END act_tx_cnt, 　　　　 　　　　FinishThe complet

Summary of index, foreign key, and field syntax maintenance for mysql, SQL Server, and oracle databases, and SQL Server oracle Summary of index, foreign key, and field syntax maintenance for mysql, SQL Server, and oracle databases

Oracle learning notes 3 SQL commands, oracle learning notes SQLSQL introduction SQL supports the following types of commands: 1. data Definition Language (DDL) 2. data manipulation language (DML) 3. transaction Control Language (TCL) 4. the Data Control Language (DCL) is a detailed note of the four

Oracle-based SQL Optimization MethodologyThe ultimate goal of SQL Optimization in Oracle databases is to shorten the execution time of target SQL statements. To achieve the above purpose, we usually have the following three methods to choose from:1. Reduce the resource consu

Oracle Advanced SQL (4) -- SQL column and column conversion topic 2, oracle -- SQL [Previous topic] column-and-column conversion 1-Introduction to functions of aggregate and unaggregate Implementation case 1001: lufei1001 shanzhi1001 namei1001 qiaoba: 1001 lufei, shanzhi, na

The number/frequency of SQL queries in ORACLE and the number of SQL queries in oracle In ORACLE Database Application optimization, the execution Frequency/frequency of an SQL statement is also frequently concerned, because the exe

Tags: calculate high-precision modified address EFI struct arithmetic uname table structureSQL queries and SQL functions 　　This chapter aims 　　　　Understanding Oracle Data Types Understanding Data Definition Languages and data manipulation languages Understanding Transaction Control Languages and Data Control languages Mastering SQL Operators and

to the base64binary type. The timestamp in Oracle is stored in a time format. Therefore, you cannot load SQL Server timestamp with the same dataset and have timestamp that loads Oracle. Because this value is rarely used in the application, you can not retrieve this field. Timestamp in Oracle cannot be automatically

Tags: style blog http io color OS SP for strongTo synchronize data from Oracle in real time to MS SQL Server, you need to read and write data directly to SQL Server in Oracle, and you can install the Oracle database for SQL Server

Tags: http io sp CTI on C SQL R BSWhere is the Oracle SQL Developer connection information saved?Oracle SQL Developer connection information is missing after switching the logged-on user. As long as the previous user information still exists, you can C:\Users\ the user name

Oracle learning notes 4 SQL commands (2): SQL operation language category, oracle learning notes SQL is classified into the following language categories1. Data Definition Language (DDL)Create, Alter, Drop 2. Data manipulation language (DML)Insert, Select, Delete, Update 3.

difficulty of SQL optimization does not know how to continue the essence or accumulation is not enough, there is no rapid improvement in the level of methods. You can try to read "Oracle-based SQL optimization" to see if this book can alleviate your problems, if not, you come and discuss with me.2, you This is a very big problem, and how the table design and the

It was freezing, and I stayed at home and read "Mastering Oracle SQL" 2nd. I found that Oracle is still very powerful, and there are two hundred optical functions. It is difficult to simulate the Object-Oriented Query languages, in particular, Windows functions for OLAP in sql2003.Fortunately, hibernate3.0 also supports SQL