sqldatatypes

问题 I want to get the columns names and datatype and its datatype's length .as example if there is a table SQL> create table TestTable( 2 ID VARCHAR2(4) NOT NULL, 3 CODE Number(5), 4 MyDate DATE, 5 MyNumber Number(8,2)) I need something like in some_column to identify separately number(5) is for an integer and number(8,2) is for a desimal value... I tried this SELECT column_name, data_type, data_length FROM USER_TAB_COLUMNS WHERE table_name = 'some_table' but this data_length gives me the length

问题 When I run this query with PDO to a mysql db it returns wrong datatypes. <?php $parameters = array(":1",92323); $query = " SELECT s.Site_ID,s.Site_Url,s.Site_Name, s.Site_Approved, s.Site_Status, s.Thumbnailed ,st.Description AS Site_Status_Desc FROM Sites s LEFT JOIN Sites_Status st ON st.Status_ID = s.Site_Status WHERE s.Account_ID = :1"; try { $this->DBH = new PDO("mysql:host={$host};dbname={$db}", $user, $pass, array(PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES utf8")); $this->stmt = $this-

问题 I am stuying PL/SQL & I am going through the bind variable . I understood that the bind variable we used to pass RUN-TIME values. but what is the difference between & and :(colon) in PL/SQL? both are same or is their any difference between this two? when should I use & and : ? 回答1: The & is used in SQL*Plus only, it has no meaning outside of it. While SQL*Plus "parses" the input buffer, it replaces &variables with what they were define d to. See also this link and this link. The technical

问题 I am stuying PL/SQL & I am going through the bind variable . I understood that the bind variable we used to pass RUN-TIME values. but what is the difference between & and :(colon) in PL/SQL? both are same or is their any difference between this two? when should I use & and : ? 回答1: The & is used in SQL*Plus only, it has no meaning outside of it. While SQL*Plus "parses" the input buffer, it replaces &variables with what they were define d to. See also this link and this link. The technical

问题 What is corresponding c++ data type to SQL numeric(18,0) data type? I need a datatype in C++ to store numeric(18,0) of SQL in it. 回答1: It says in "msdn" that the numeric is mapped to CString in C++. Reference: http://msdn.microsoft.com/en-us/library/eshhha8h.aspx 回答2: That would be a long long (at least 64 bits). 来源： https://stackoverflow.com/questions/10409089/what-is-corresponding-c-data-type-to-sql-numeric18-0-data-type

问题 I have the following problem: I am using an archiving software that exports its data to an MS SQL database, one of the columns being designated Timestamp_S (which represents the unix time), and it is an 32 bit integer. This database needs to be queried by a different reporting software. The problem is that the reporting software requires its entries to have a field named "Timestamp" and also that the data type be SQL timestamp. I am currently trying to select the data that the archiving

问题 I want to store a field which stores channel clicks per day( increasing every second and updated in a day ) into MySQL DB table. What datatype should I assign to the column keeping in mind that it can even be less than 100 or can even exceed a million . 回答1: MySQL Integer Types (Exact Value): Fixed-Point Types (Exact Value) - DECIMAL, NUMERIC: In standard SQL, the syntax DECIMAL(M) is equivalent to DECIMAL(M,0). Similarly, the syntax DECIMAL is equivalent to DECIMAL(M,0), where the

问题 I have a MS SQL Server 2008 database on a shared hosting and I need to reduce the used storage space as much as possible. My largest table has the following definition: CREATE TABLE [stage]( [station_id] [smallint] NOT NULL, [time_utc] [smalldatetime] NOT NULL, [stage_mm] [smallint] NOT NULL, CONSTRAINT [PK_stage] PRIMARY KEY CLUSTERED ([station_id] ASC,[time_utc] ASC) I tried to find out the average number of bytes per record in my table. According to theory the size should be: 4B (row

问题 I want to save some data from a system table user_tab_cols, to a temp table so I can take a dump from it. There are 100,000 rows in it , I have select from user_tab_cols about 1,000 records and d save them into a temp table with this query: create table temp table as select * from user_tab_cols where condition... I had error 'illegal use of longtype' , because of the column DATA_DEFAULT that contain a type of long. Is there an alterantive way where I can store a long type into anotehr table?

问题 I have a field in my SQL Server 2012 table defined as Int. but when I try to get the value from a textbox in C# using the converting (Convert.toint32(textbox.text)). Lets say if the textbox contains the number 0032, it will be saved to the database as 32 removing the 00. Any solutions other than changing the Field Data Type?? 回答1: Numeric datatypes do not retain leading zeros, as they are insignificant to the number you want to store. Char or Varchar is more appropriate. You could set a