django field types

'interval'When '000000' then 'nchar'When '000000' then 'nvarchar' When '000000' then 'int8'When '000000' then 'serial8'When '000000' then'set'When '100' then' et'When '000000' then 'LIST'When '000000' then 'unnamed row'When '000000' then 'lvarchar'When '000000' then 'clob'When '000000' then 'blob'When '000000' then'boolean' When '100' then' named row'End as coltypename, B. colno from orders Ables a left join syscolumns B on. tabid = B. tabid where. tabid> 99 and. tabtype = 't'order by. tabname,

, 12, and 14.You can specify an arbitrary display size when creating a table, but the defined column length is 0 or greater than 14, and the column length is forcibly defined as 14.The column length ranges from 1 ~ The dimensions of odd values in the range of 13 are forced to be the next larger even number.Example:Define Field Length Force Field LengthTimestamp (0)-> timestamp (14)Timestamp (15)-> timestamp

Logs are used to record events. Therefore, the log content should include:Event Date and Time:Precision: Millisecond (the most common time unit in Java), microsecond (commonly used time units in other languages such as PHP), and nanoseconds;Type: datetime, double, long ,,,Event subjectType: StringEvent objectType: StringEvent DescriptionType: StringEvent TypeType: int, String ,,,Event level:Type: int, stringIP address or name of the Log Data source:Type: IP, stringSummary: int, long, double, Str

Exception in thread "main" java.io.InvalidClassException:com.spring.domain.Request; Incompatible types for field addressstatus at Java.io.ObjectStreamClass.matchFields (objectstreamclass.java:2399) A T Java.io.ObjectStreamClass.getReflector (objectstreamclass.java:2293) at Java.io.ObjectStreamClass.initNonProxy ( objectstreamclass.java:741) at the Java.io.ObjectInputStream.readNonProxyDesc (objectinputst

The Unicode character set is created to resolve incompatible problems with character sets, all of which are represented in two bytes, which is also represented in two bytes. If still for this tangle, just look at the back of the commentary, make a decision. In general, if you use the Chinese or other special characters, I will use the type of n beginning, otherwise the direct use of the Var start. What is the difference between varchar and nvarchar in SQL Server? For: VARCHAR (n) A variable le

. Querying the fields and data types of a tableSelect Column_name,data_type from Information_schema.columnsWHERE table_name = ' table name '9. Using TransactionsSQL Server transactions can be used when working with temporary SQL statements on database tables to prevent errors from being detected after data manipulation.Start a transactionBegin TranInsert into TableName Values (...)If the SQL statement operation is not working correctly, the transactio

SQL Alter methods to modify field types and names ALTER TABLE "table_name"[Change Mode] Add a field: Add "Field 1" "Field 1 Data category" MySQL Tutorials > CREATE TABLE Employee ( -> id int, -> first_ name VARCHAR, -> last_name VARCHAR, -> start_date Date, -> e

Tags: color objects type select Val Table name Export Data desc ObjectSELECT(case if A.colorder=1 then d.name Else ' end) Table name,A.colorder Field Ordinal,A.name Field Name,B.name field type,b.length field Length,G.[value] As Field descriptionFrom syscolumns a LEFT join s

In MySQL, there are two field types that are confusing, that is, text and blobs, especially bloggers who write their own blog do not know to change to their own blog positive text segment select text or blob type. Here are a few differences: I. Main differences The main difference between the text and the Blob is that the BLOB holds the binary data and the text holds the character data. At present, almos

Pl/sql Procedure: Data reading of Clob field types in Oracle 11g the database column of the LOB type stores only the locator, which points to the storage location of the large object. manipulate LOB data with the Dbms_lob package. When reading data with an Oracle field type of CLOB column, only part of the following figure can be read: a full read of the data

Label: Reprint Original AddressHttp://www.cnblogs.com/Fooo/archive/2009/08/27/1554769.htmlSELECT (case if A.colorder=1 then d.name Else ' end) Table name, A.colorder field ordinal, a.name field name, when Colum Nproperty (a.id,a.name, ' isidentity ') =1 then ' √ ' Else ' "End", (case when (SELECT count (*) from SYSO Bjects WHERE (name in (SELECT name from sysindexes WHERE (id

Statement:ALTER TABLE tableName Rename column oldcname to Newcname; --Modify field namesALTER TABLE TableName Modify (cloumnname data type); --Modifying data typesFor example:1. Create a table:CREATE TABLE Student (ID VARCHAR2 (+) primary key,Name VARCHAR2 (8) is not NULL,Age Number);2. Modify the field name:ALTER TABLE Student rename name to Stuname;3. Modify the data type:ALTER TABLE Student Modify (ID va

Oracle uses SQL statements to modify field types1. If there is no data in the tableSQL code 123 altertable 表名 modify （字段名1 类型,字段名2 类型,字段名3 类型.....） alter table student modify(id number(4));---将student表中id字段改为number，长度4 alter tablestudent modify(id number(4),studentName varchar2(100)); 2. If there is data in the original tableSQL code 12 --修改原字段名 ALTERTABLE 表名 RENAME COLUMN 字段名 TO字段名1;

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

# int 0 ~ More than 4 billion# Mediumint 0 ~ more than 16 million# smallint 0 ~ 65535# tinyint 0 ~ 255# varchar (5) and char (5) What's the difference?# varchar (5) Can I save ' abcdef '? The same cannot be saved!# as stored ' abc ' char (5), 5 characters, byte: gbk/Kanji * * utf8/Chinese characters# in the case of ' ABC ' varchar (5), 4 characters (it will be added by default), Bytes: gbk/Kanji * * utf8/Kanji# Char,varchar,text max length?# char: maximum of 255 characters# varchar: Up to 65,535

whenCol.isnullable= 1 Then '√' ELSE "' END asallow NULL,ISNULL(Comm.text,"') asDefault Value fromDbo.syscolumns Col Left JOINDbo.systypes T onCol.xtype=T.xusertypeInner JOINDbo.sysobjects obj onCol.id=obj.id andObj.xtype= 'U' andObj.status>= 0 Left JOINDbo.syscomments Comm onCol.cdefault=comm.id Left JOINSys.extended_properties EP onCol.id=ep.major_id andCol.colid=ep.minor_id andEp.name= 'ms_description'