Processing of Reserved Words in MySQL

9.6.MySQL tries to use an identifier for processing reserved words. For example, using an embedded MySQL DATA type or function name as a table name or column name, such as TIMESTAMP or GROUP may cause a common problem. This operation is allowed (for example, ABS can be used as a column name ). However, by default (

9.6.MySQL tries to use an identifier for processing reserved words. For example, using an embedded MySQL DATA type or function name as a table name or column name, such as TIMESTAMP or GROUP may cause a common problem. This operation is allowed (for example, ABS can be used as a column name ). However, by default (

9.6. Processing of Reserved Words in MySQL

Try to use an identifier, such as using the embedded MySQL DATA type or function name as the table name or column name, such as TIMESTAMP or GROUP, which may cause a common problem. This operation is allowed (for example, ABS can be used as a column name ). However, by default, spaces are not allowed between the '(') at the end of the function name in a number call. This requirement makes the function call different from the column name reference.

The negative result of this behavior is that a space is omitted in some contexts and the identifier is interpreted as the function name. For example, the statement is valid:

mysql> CREATE TABLE abs (val INT)；

However, omitting spaces after abs may cause syntax errors, because the statement seems to call the ABS () function:

mysql> CREATE TABLE abs(val INT);

If the SQL Server mode includes the IGNORE_SPACE mode value, the server allows space between the function name and. In this way, the function name is considered as a reserved word. The result is that the identifiers with the same function name must follow the description in section 9.2, "database, table, index, column, and alias. The SQL Server mode is controlled as described in section 5.3.2 and "SQL SERVER mode.

The word after the period in a qualified name must be an identifier, so it does not need to be caused, even if it is a reserved word.

In MySQL, the words in the following table are explicitly reserved. Most numeric statements are used as column names and/or table names (for example, GROUP) by standard SQL statements ). A few are retained because MySQL needs them (currently ).YaccParser. Reserved Words can be used as identifiers after being caused.

ADD	ALL	ALTER
ANALYZE	AND	AS
ASC	ASENSITIVE	BEFORE
BETWEEN	BIGINT	BINARY
BLOB	BOTH	BY
CALL	CASCADE	CASE
CHANGE	CHAR	CHARACTER
CHECK	COLLATE	COLUMN
CONDITION	CONNECTION	CONSTRAINT
CONTINUE	CONVERT	CREATE
CROSS	CURRENT_DATE	CURRENT_TIME
CURRENT_TIMESTAMP	CURRENT_USER	CURSOR
DATABASE	DATABASES	DAY_HOUR
DAY_MICROSECOND	DAY_MINUTE	DAY_SECOND
DEC	DECIMAL	DECLARE
DEFAULT	DELAYED	DELETE
DESC	DESCRIBE	DETERMINISTIC
DISTINCT	DISTINCTROW	DIV
DOUBLE	DROP	DUAL
EACH	ELSE	ELSEIF
ENCLOSED	ESCAPED	EXISTS
EXIT	EXPLAIN	FALSE
FETCH	FLOAT	FLOAT4
FLOAT8	FOR	FORCE
FOREIGN	FROM	FULLTEXT
GOTO	GRANT	GROUP
HAVING	HIGH_PRIORITY	HOUR_MICROSECOND
HOUR_MINUTE	HOUR_SECOND	IF
IGNORE	IN	INDEX
INFILE	INNER	INOUT
INSENSITIVE	INSERT	INT
INT1	INT2	INT3
INT4	INT8	INTEGER
INTERVAL	INTO	IS
ITERATE	JOIN	KEY
KEYS	KILL	LABEL
LEADING	LEAVE	LEFT
LIKE	LIMIT	LINEAR
LINES	LOAD	LOCALTIME
LOCALTIMESTAMP	LOCK	LONG
LONGBLOB	LONGTEXT	LOOP
LOW_PRIORITY	MATCH	MEDIUMBLOB
MEDIUMINT	MEDIUMTEXT	MIDDLEINT
MINUTE_MICROSECOND	MINUTE_SECOND	MOD
MODIFIES	NATURAL	NOT
NO_WRITE_TO_BINLOG	NULL	NUMERIC
ON	OPTIMIZE	OPTION
OPTIONALLY	OR	ORDER
OUT	OUTER	OUTFILE
PRECISION	PRIMARY	PROCEDURE
PURGE	RAID0	RANGE
READ	READS	REAL
REFERENCES	REGEXP	RELEASE
RENAME	REPEAT	REPLACE
REQUIRE	RESTRICT	RETURN
REVOKE	RIGHT	RLIKE
SCHEMA	SCHEMAS	SECOND_MICROSECOND
SELECT	SENSITIVE	SEPARATOR
SET	SHOW	SMALLINT
SPATIAL	Specpacific	SQL
SQLEXCEPTION	SQLSTATE	SQLWARNING
SQL _BIG_RESULT	SQL _CALC_FOUND_ROWS	SQL _SMALL_RESULT
SSL	STARTING	STRAIGHT_JOIN
TABLE	TERMINATED	THEN
TINYBLOB	TINYINT	TINYTEXT
TO	TRAILING	TRIGGER
TRUE	UNDO	UNION
UNIQUE	UNLOCK	UNSIGNED
UPDATE	USAGE	USE
USING	UTC_DATE	UTC_TIME
UTC_TIMESTAMP	VALUES	VARBINARY
VARCHAR	VARCHARACTER	VARYING
WHEN	WHERE	WHILE
WITH	WRITE	X509
XOR	YEAR_MONTH	ZEROFILL

MySQL allows some keywords to be used as unprovoked identifiers, because many people have used them before. Some examples are listed below:

• ACTION

• BIT

• DATE

• ENUM

• NO

• TEXT

• TIME

• TIMESTAMP