MariaDB is quite flexible about implicit and explicit type conversions. MariaDB does not support the sql_variant type. Past versions of the row will be preserved. In this way, the timestamp will be updated whenever the column is modified.Ī way to preserve much more information is to use a temporal table. Its default value should be ON UPDATE CURRENT_TIMESTAMP. If the only purpose is to check if a row has been modified since its last read, a TIMESTAMP column can be used instead. MariaDB does not have the rowversion type. In MariaDB, this depends on the PAD_CHAR_TO_FULL_LENGTH sql_mode flag.ĥ) See JSON, below. If not sure, use utf16 in MariaDB.Ĥ) In SQL Server, the value of ANSI_PADDING determines if char values should be padded with spaces to their maximum length. TEXT columns do not contribute to the row size, because they are stored separately (except for the first 12 bytes).ģ) In SQL Server, UTF-16 is used if data contains Supplementary Characters, otherwise UCS-2 is used. So it is possible to use a smaller character set on MariaDB too.Ģ) InnoDB has a maximum row length of 65,535 bytes. String and Binary Binary Stringsġ) If SQL Server uses a non-unicode collation, a subset of UTF-8 is used. See Data Type Storage Requirements for the details. The subsecond part is never approximated. Precisionįor temporal types that include a day time, MariaDB allows a precision from 0 to 6 (microseconds), 0 being the default. See Date and Time Literals for the details. Using these eliminates possible ambiguities in contexts where a temporal value could be interpreted as a string or as an integer. The syntax defined in standard SQL and ODBC are understood - for example, DATE '' and. Typically used formats are 'YYYY-MM-DD' and YYYYMMDD. Several different date formats are understood. These values can be disallowed by setting sql_mode=NO_ZERO_IN_DATE. It is also possible to use values where only some date parts are zeroes, for example '' or ''. This can be disallowed by setting sql_mode=NO_ZERO_DATE. MariaDB allows a special value where all the parts of a date are zeroes: ''. YEAR is a 1-byte type representing years between 19, as well as 0000.It is not meant to be a unique row identifier. The value can optionally be automatically set to the current timestamp on insert, on update, or both. In MariaDB it is the number of seconds elapsed since the beginning of, with a decimal precision up to 6 digits (0 by default). TIMESTAMP has little to do with SQL Server's timestamp.You may also consider the following MariaDB types: MariaDB values are not approximated, see below. In MariaDB 'True' and 'False' are always strings. To understand what this implies, see Boolean Literals. TRUE and FALSE keywords also exist, but they are synonyms for 1 and 0. In MariaDB it is possible to do the same, but this is not a common practice.Ī column can also be defined as BOOLEAN or BOOL, which is just a synonym for TINYINT. In SQL Server, it is common to use bit to represent boolean values. MariaDB and SQL Server have different sets of bitwise operators. For more details, see Binary Literals and Hexadecimal Literals. Where value is a sequence of 0 and 1 digits. In MariaDB, binary values can be written in one of the following ways: If we insert a value which requires less bits than the ones that are allocated, zero-bits are padded on the left. This means that, if you use enough decimal digits, operations on these types may produce different results than the results they would produce on MariaDB types. money and smallmoney are accurate to about 4 decimal digits. There is a small incompatibility that users should be aware about. It is possible to store, for example, the amount of money multiplied by 100.
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