What data types are there in ORACLE
1. The core of the Oracle database is the table. The common data types used in the columns in the table are as follows: Examples corresponding to the NUMBER type: For date types , you can use the sysdate built-in function to get the current system date and time and return the DATE type, and use the systimestamp function to return the current date, time and time zone.
2. Oracle database provides two numerical data types specifically for floating-point numbers: BINARY_FLOATBINARY_FLOAT is a 32-bit, single-precision floating-point digital data type. Can support at least 6 digits of precision, each BINARY_FLOAT value requires 5 bytes, including the length byte.
3. Oracle itself does not have these data types, but integer is a SQL standard, so it is also compatible. The following is executable in Oracle.
4. The number type includes all number types. It can be an integer or a numeric Oracle data type. Oracle's number type is one of Oracle's built-in types and is the most basic numerical data type of Oracle. What are the commonly used fields in databases?
The field types in database tables include binary data types, character data types, numeric data types, etc.
． Text: used to enter text or data combining text and numbers. It is one of the most commonly used field types. It is divided into short text and long text. The difference is that the length of short text does not exceed 255 characters. Characters (bytes).
In a database, most of the time, the "columns" of a table are called "fields", and each field contains information about a certain topic. Just like in the "Address Book" database, "Name" and "Contact Number" are the unique attributes of all rows in the table, so these columns are called the "Name" field and "Contact Number" field.
Currency type: used to store currency values, occupying 8 bytes. Rounding is prohibited in calculations. Numeric: Data that can be used for numerical calculations other than currency. What are the data types of fields in Access database?
. Text: used to enter text or data combining text and numbers. It is one of the most commonly used field types. It is divided into short text and long text. The difference is that the length of short text does not exceed 255 characters. Characters (bytes).
Access allows nine data types: text, notes, numerical values, date/time, currency, automatic number, yes/no, OLE object, hyperlink, query wizard.
Access allows nine data types: text, notes, numerical values, date/time, currency, automatic number, yes/no, OLE object, hyperlink, query wizard. In the design view of a table, each field has a design type. What are the commonly used data types in SQL databases
Numeric data only contains numbers. Numeric data types include positive and negative numbers, decimals (floating point), and integers. Integers consist of positive and negative integers, such as 320-2 and 33967. In Microsoft SQL Server, the data types stored in integers are int, smallint, and tinyint.
MySQL data types In MySQL, there are three main types: Text (text), Number (number) and Date/Time (date/time) type. Without further ado, let’s go straight to the picture.
Integer data type The integer data type is one of the most commonly used data types. int (integer) smallinttinyintbigint floating point data type The floating point data type is used to store decimal fractions.
Numerical type Mysql supports all numeric types in standard SQL, including strict data types (INTEGER, SMALLINT, DECIMAL, NUMBERIC), and approximate numeric data types (FLOAT, REAL, DOUBLEPRESISION), and here expand on the basis. What are the data types in the database?
CHAR() The CHAR data type is a string with a fixed length and a maximum length. Data stored in fields of data type CHAR will be padded with spaces to the maximum length. The length is defined between 1-2000 bytes.
String type. Number type. Date type. Other data types.
There are four and eight basic data types, namely: integer type: byte, short, int, long. Floating point type: float, double. Logical type: boolean. Character type: char.
The commonly used data types in databases are as follows: Integer data type: The integer data type is one of the most commonly used data types. Floating point data type: Floating point data type is used to store decimal fractions.
Floating-point numerical data is stored in SQL Server using roundup (or rounding only) method.
Integer data type: The integer data type is one of the most commonly used data types. INT (INTEGER) The INT (or INTEGER) data type stores everything from -2 to the power of 31 (-2, 147, 483, 648) to 2 to the power of 31 -1 (2, 147, 483, 647) Positive and negative integers.
MySQL data types have the following data types in MySQL: (1) Numeric values ??are values ??such as 32 or 154. MySQL supports scientific notation, which is represented by an integer or floating point number followed by "e" or "E", a sign ("+" or "-"), and an integer exponent. Database field type design
1. Date: used to store dates without time. Mysql obtains and displays this type in the format of "YYYY-MM-DD". The supported time range is "1000-00-00" to "9999-12-31"; TimeStamp: stores data with both date and time.
2. Text: used to enter text or data combining text and numbers. It is one of the most commonly used field types. It is divided into short text and long text. The difference is that the length of short text does not exceed 255 characters. Characters (bytes).
3. Access allows nine data types: text, notes, numerical values, date/time, currency, automatic number, yes/no, OLE object, hyperlink, and query wizard. In the design view of a table, each field has a design type.
4. You can separate them with commas, but the length of this field must be larger. For example, varchar(255), if it is not enough, you can use text type. Or simply one picture and one database record. In this way, the content corresponding to the picture can also be stored in a record.