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For integer values, MySQL offers you a choice of the TINYINT, SMALLINT, MEDIUMINT, INT, and BIGINT types, which differ from each other only in the size of values they can store Use the TINYINT and SMALLINT types for small integer values, the INT type for larger integer values, and the BIGINT type for extremely large values For floatingpoint values, use the FLOAT and DOUBLE types for single-precision and double-precision floating point values, respectively And, finally, for decimal values, use the DECIMAL data type When defining an integer field, you can include a width specifier in parentheses This width specifier controls the padding MySQL applies to the field when retrieving it from the database For a field defined as BIGINT (20), MySQL will automatically pad the value to 20 characters before displaying it
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When defining floating-point and decimal fields, MySQL enables you to include both a width specifier and a precision specifier For example, the declaration FLOAT (7,4) specifies that displayed values will not contain more than seven digits, with four digits after the decimal point You can also add the ZEROFILL attribute to pad values with leading zeroes, and the UNSIGNED attribute to force a field to only accept positive values
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PARTIII PART PART
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C aution By default, MySQL will automatically truncate or round values down to the
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maximum allowed value for the field they re being placed in To avoid this and instead have MySQL generate an error, run MySQL in strict mode A discussion of MySQL modes can be found in 10
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Character and String Types
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MySQL lets you store strings up to 255 characters in length as either a CHAR or VARCHAR type The difference between these two types is simple: CHAR fields are fixed to the length specified at the time of definition, while VARCHAR fields can grow and shrink dynamically, based on the data entered into them This makes VARCHAR fields more suitable for fields that accept variable-length data, and CHAR fields better for fields that always contain values of the same length Both CHAR and VARCHAR type definitions must include a width specifier in parentheses, as with numeric type definitions Thus, the definition CHAR (10) creates a field whose length remains exactly 10 characters, regardless of what is entered into it, while the definition VARCHAR (10) creates a field whose length can range anywhere between 0 and 10 characters, depending on what is entered into it
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Text and Binary Types
MySQL enables you to store strings greater than 255 characters in length as either a TEXT or BLOB type The difference between TEXT and BLOB types is minimal at best: TEXT types are compared in a case-insensitive manner, while BLOB types are compared in a case-sensitive manner For this reason, BLOBs are usually used to store binary data, while TEXT fields are used to store ASCII data Depending on the size of the string you re trying to store, MySQL offers you a choice of the TINYTEXT, TEXT, MEDIUMTEXT, and LONGTEXT types (for ASCII text blocks) and the TINYBLOB, BLOB, MEDIUMBLOB, and LONGBLOB types (for binary data)
Date and Time Types
For simple date and time values, MySQL offers the intelligently named DATE and TIME data types The DATE type is used to store date values consisting of year, month, and day components, while the TIME type is used for time values or durations consisting of hour, minute, and second components Both DATE and TIME types can be used for values in either numeric (YYYYMMDD and HHMMSS) or string ( YYYY-MM-DD and HH:MM:SS ) format
Part I:
Usage
If what you need is a combination of the two, consider using the DATETIME or TIMESTAMP types, both of which let you specify both date and time values in a single field The difference between the two lies in how the values are stored: DATETIME fields are stored in the form YYYY-MM-DD HH:MM:SS , and TIMESTAMP fields are stored in the form YYYYMMDDHHMMSS
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