位置: 编程技术 - 正文

MySQL 5.7中的关键字与保留字详解(mysql常用关键字及其用法)

编辑:rootadmin

推荐整理分享MySQL 5.7中的关键字与保留字详解(mysql常用关键字及其用法),希望有所帮助,仅作参考,欢迎阅读内容。

文章相关热门搜索词:mysql的关键字执行顺序,mysql常用关键字及其用法,mysql的关键字执行顺序,mysql常用关键字及其用法,mysql的关键字执行顺序,mysql关键字是什么意思,mysql关键表,mysql的关键字有哪些,内容如对您有帮助,希望把文章链接给更多的朋友!

前言

MySQL和Oracle的关键字还是不尽相同的,在Oracle数据库中,我们的数据表中定义了大量的code字段用来表示主键,但是在MySQL中code是关键字,使用以前的处理方法就有些“水土不服”。

下面我们来了解一下MySQL中的关键字和保留字。

什么是关键字和保留字

关键字是指在SQL中有意义的字。 某些关键字(例如SELECT,DELETE或BIGINT)是保留的,需要特殊处理才能用作表和列名称等标识符。 这一点对于内置函数的名称也适用。

如何使用关键字和保留字

非保留关键字允许作为标识符,不需要加引号。 如果您要适用保留字作为标识符,就必须适用引号。

举个例子,BEGIN和END是关键字,但不是保留字,因此它们用作标识符不需要引号。 INTERVAL是保留关键字,必须加上引号才能用作标识符。

我们看到,第一条语句中表名使用了保留字interval,执行失败;

第二条语句对interval加了引号,执行成功。

在这里需要注意的是,引号必须是反引号,而非单引号。否则会报错,如下所示:

有一个例外

如果标识符在限定名称(数据库名)的句点之后,即使是保留关键字也不需要引号。

我们以hoegh数据库为例,如果表名写为hoegh.interval就不需要对保留字interval加引号了。

关于使用内置函数名称

允许内置函数的名称可以作为标识符,但最好谨慎使用。例如,COUNT作为列名称是合法的。但是,默认情况下,在函数名和后面的(之间的函数调用中不允许有空格。这个限制使解析器能够区分名称是用于函数调用还是用在非函数上下文中。

附录

在某些时候,您可能需要升级到更高版本,因此最好查看一下未来的保留字。您可以在涵盖更高版本的MySQL的手册中找到这些。对于表中的大多数保留字,在标准SQL中禁止作为列或表的名称(例如,GROUP)。其中一些保留字,是由于MySQL需要它们并使用一个yacc解析器。

以下列出三张表格:

第一个表格.2显示MySQL 5.7中的关键字和保留字。保留的关键字标记为(R)。此外,_FILENAME是保留的。

第二个表格.3显示MySQL 5.7相比5.6版本新增的保留字。

第三个表格.4显示MySQL 5.7相比5.6版本删除的保留字。

Table .2 Keywords and Reserved Words in MySQL 5.7

ACCESSIBLE (R) ACCOUNT[a] ACTION ADD (R) AFTER AGAINST AGGREGATE ALGORITHM ALL (R) ALTER (R) ALWAYS[b] ANALYSE ANALYZE (R) AND (R) ANY AS (R) ASC (R) ASCII ASENSITIVE (R) AT AUTOEXTEND_SIZE AUTO_INCREMENT AVG AVG_ROW_LENGTH BACKUP BEFORE (R) BEGIN BETWEEN (R) BIGINT (R) BINARY (R) BINLOG BIT BLOB (R) BLOCK BOOL BOOLEAN BOTH (R) BTREE BY (R) BYTE CACHE CALL (R) CASCADE (R) CASCADED CASE (R) CATALOG_NAME CHAIN CHANGE (R) CHANGED CHANNEL[c] CHAR (R) CHARACTER (R) CHARSET CHECK (R) CHECKSUM CIPHER CLASS_ORIGIN CLIENT CLOSE COALESCE CODE COLLATE (R) COLLATION COLUMN (R) COLUMNS COLUMN_FORMAT COLUMN_NAME COMMENT COMMIT COMMITTED COMPACT COMPLETION COMPRESSED COMPRESSION[d] CONCURRENT CONDITION (R) CONNECTION CONSISTENT CONSTRAINT (R) CONSTRAINT_CATALOG CONSTRAINT_NAME CONSTRAINT_SCHEMA CONTAINS CONTEXT CONTINUE (R) CONVERT (R) CPU CREATE (R) CROSS (R) CUBE CURRENT CURRENT_DATE (R) CURRENT_TIME (R) CURRENT_TIMESTAMP (R) CURRENT_USER (R) CURSOR (R) CURSOR_NAME DATA DATABASE (R) DATABASES (R) DATAFILE DATE DATETIME DAY DAY_HOUR (R) DAY_MICROSECOND (R) DAY_MINUTE (R) DAY_SECOND (R) DEALLOCATE DEC (R) DECIMAL (R) DECLARE (R) DEFAULT (R) DEFAULT_AUTH DEFINER DELAYED (R) DELAY_KEY_WRITE DELETE (R) DESC (R) DESCRIBE (R) DES_KEY_FILE DETERMINISTIC (R) DIAGNOSTICS DIRECTORY DISABLE DISCARD DISK DISTINCT (R) DISTINCTROW (R) DIV (R) DO DOUBLE (R) DROP (R) DUAL (R) DUMPFILE DUPLICATE DYNAMIC EACH (R) ELSE (R) ELSEIF (R) ENABLE ENCLOSED (R) ENCRYPTION[e] END ENDS ENGINE ENGINES ENUM ERROR ERRORS ESCAPE ESCAPED (R) EVENT EVENTS EVERY EXCHANGE EXECUTE EXISTS (R) EXIT (R) EXPANSION EXPIRE EXPLAIN (R) EXPORT EXTENDED EXTENT_SIZE FALSE (R) FAST FAULTS FETCH (R) FIELDS FILE FILE_BLOCK_SIZE[f] FILTER[g] FIRST FIXED FLOAT (R) FLOAT4 (R) FLOAT8 (R) FLUSH FOLLOWS[h] FOR (R) FORCE (R) FOREIGN (R) FORMAT FOUND FROM (R) FULL FULLTEXT (R) FUNCTION GENERAL GENERATED[i] (R) GEOMETRY GEOMETRYCOLLECTION GET (R) GET_FORMAT GLOBAL GRANT (R) GRANTS GROUP (R) GROUP_REPLICATION[j] HANDLER HASH HAVING (R) HELP HIGH_PRIORITY (R) HOST HOSTS HOUR HOUR_MICROSECOND (R) HOUR_MINUTE (R) HOUR_SECOND (R) IDENTIFIED IF (R) IGNORE (R) IGNORE_SERVER_IDS IMPORT IN (R) INDEX (R) INDEXES INFILE (R) INITIAL_SIZE INNER (R) INOUT (R) INSENSITIVE (R) INSERT (R) INSERT_METHOD INSTALL INSTANCE[k] INT (R) INT1 (R) INT2 (R) INT3 (R) INT4 (R) INT8 (R) INTEGER (R) INTERVAL (R) INTO (R) INVOKER IO IO_AFTER_GTIDS (R) IO_BEFORE_GTIDS (R) IO_THREAD IPC IS (R) ISOLATION ISSUER ITERATE (R) JOIN (R) JSON[l] KEY (R) KEYS (R) KEY_BLOCK_SIZE KILL (R) LANGUAGE LAST LEADING (R) LEAVE (R) LEAVES LEFT (R) LESS LEVEL LIKE (R) LIMIT (R) LINEAR (R) LINES (R) LINESTRING LIST LOAD (R) LOCAL LOCALTIME (R) LOCALTIMESTAMP (R) LOCK (R) LOCKS LOGFILE LOGS LONG (R) LONGBLOB (R) LONGTEXT (R) LOOP (R) LOW_PRIORITY (R) MASTER MASTER_AUTO_POSITION MASTER_BIND (R) MASTER_CONNECT_RETRY MASTER_DELAY MASTER_HEARTBEAT_PERIOD MASTER_HOST MASTER_LOG_FILE MASTER_LOG_POS MASTER_PASSWORD MASTER_PORT MASTER_RETRY_COUNT MASTER_SERVER_ID MASTER_SSL MASTER_SSL_CA MASTER_SSL_CAPATH MASTER_SSL_CERT MASTER_SSL_CIPHER MASTER_SSL_CRL MASTER_SSL_CRLPATH MASTER_SSL_KEY MASTER_SSL_VERIFY_SERVER_CERT(R) MASTER_TLS_VERSION[m] MASTER_USER MATCH (R) MAXVALUE (R) MAX_CONNECTIONS_PER_HOUR MAX_QUERIES_PER_HOUR MAX_ROWS MAX_SIZE MAX_STATEMENT_TIME[n] MAX_UPDATES_PER_HOUR MAX_USER_CONNECTIONS MEDIUM MEDIUMBLOB (R) MEDIUMINT (R) MEDIUMTEXT (R) MEMORY MERGE MESSAGE_TEXT MICROSECOND MIDDLEINT (R) MIGRATE MINUTE MINUTE_MICROSECOND (R) MINUTE_SECOND (R) MIN_ROWS MOD (R) MODE MODIFIES (R) MODIFY MONTH MULTILINESTRING MULTIPOINT MULTIPOLYGON MUTEX MYSQL_ERRNO NAME NAMES NATIONAL NATURAL (R) NCHAR NDB NDBCLUSTER NEVER[o] NEW NEXT NO NODEGROUP NONBLOCKING[p] NONE NOT (R) NO_WAIT NO_WRITE_TO_BINLOG (R) NULL (R) NUMBER NUMERIC (R) NVARCHAR OFFSET OLD_PASSWORD[q] ON (R) ONE ONLY OPEN OPTIMIZE (R) OPTIMIZER_COSTS[r] (R) OPTION (R) OPTIONALLY (R) OPTIONS OR (R) ORDER (R) OUT (R) OUTER (R) OUTFILE (R) OWNER PACK_KEYS PAGE PARSER PARSE_GCOL_EXPR[s] PARTIAL PARTITION (R) PARTITIONING PARTITIONS PASSWORD PHASE PLUGIN PLUGINS PLUGIN_DIR POINT POLYGON PORT PRECEDES[t] PRECISION (R) PREPARE PRESERVE PREV PRIMARY (R) PRIVILEGES PROCEDURE (R) PROCESSLIST PROFILE PROFILES PROXY PURGE (R) QUARTER QUERY QUICK RANGE (R) READ (R) READS (R) READ_ONLY READ_WRITE (R) REAL (R) REBUILD RECOVER REDOFILE REDO_BUFFER_SIZE REDUNDANT REFERENCES (R) REGEXP (R) RELAY RELAYLOG RELAY_LOG_FILE RELAY_LOG_POS RELAY_THREAD RELEASE (R) RELOAD REMOVE RENAME (R) REORGANIZE REPAIR REPEAT (R) REPEATABLE REPLACE (R) REPLICATE_DO_DB[u] REPLICATE_DO_TABLE[v] REPLICATE_IGNORE_DB[w] REPLICATE_IGNORE_TABLE[x] REPLICATE_REWRITE_DB[y] REPLICATE_WILD_DO_TABLE[z] REPLICATE_WILD_IGNORE_TABLE[aa] REPLICATION REQUIRE (R) RESET RESIGNAL (R) RESTORE RESTRICT (R) RESUME RETURN (R) RETURNED_SQLSTATE RETURNS REVERSE REVOKE (R) RIGHT (R) RLIKE (R) ROLLBACK ROLLUP ROTATE[ab] ROUTINE ROW ROWS ROW_COUNT ROW_FORMAT RTREE SAVEPOINT SCHEDULE SCHEMA (R) SCHEMAS (R) SCHEMA_NAME SECOND SECOND_MICROSECOND (R) SECURITY SELECT (R) SENSITIVE (R) SEPARATOR (R) SERIAL SERIALIZABLE SERVER SESSION SET (R) SHARE SHOW (R) SHUTDOWN SIGNAL (R) SIGNED SIMPLE SLAVE SLOW SMALLINT (R) SNAPSHOT SOCKET SOME SONAME SOUNDS SOURCE SPATIAL (R) SPECIFIC (R) SQL (R) SQLEXCEPTION (R) SQLSTATE (R) SQLWARNING (R) SQL_AFTER_GTIDS SQL_AFTER_MTS_GAPS SQL_BEFORE_GTIDS SQL_BIG_RESULT (R) SQL_BUFFER_RESULT SQL_CACHE SQL_CALC_FOUND_ROWS (R) SQL_NO_CACHE SQL_SMALL_RESULT (R) SQL_THREAD SQL_TSI_DAY SQL_TSI_HOUR SQL_TSI_MINUTE SQL_TSI_MONTH SQL_TSI_QUARTER SQL_TSI_SECOND SQL_TSI_WEEK SQL_TSI_YEAR SSL (R) STACKED START STARTING (R) STARTS STATS_AUTO_RECALC STATS_PERSISTENT STATS_SAMPLE_PAGES STATUS STOP STORAGE STORED[ac] (R) STRAIGHT_JOIN (R) STRING SUBCLASS_ORIGIN SUBJECT SUBPARTITION SUBPARTITIONS SUPER SUSPEND SWAPS SWITCHES TABLE (R) TABLES TABLESPACE TABLE_CHECKSUM TABLE_NAME TEMPORARY TEMPTABLE TERMINATED (R) TEXT THAN THEN (R) TIME TIMESTAMP TIMESTAMPADD TIMESTAMPDIFF TINYBLOB (R) TINYINT (R) TINYTEXT (R) TO (R) TRAILING (R) TRANSACTION TRIGGER (R) TRIGGERS TRUE (R) TRUNCATE TYPE TYPES UNCOMMITTED UNDEFINED UNDO (R) UNDOFILE UNDO_BUFFER_SIZE UNICODE UNINSTALL UNION (R) UNIQUE (R) UNKNOWN UNLOCK (R) UNSIGNED (R) UNTIL UPDATE (R) UPGRADE USAGE (R) USE (R) USER USER_RESOURCES USE_FRM USING (R) UTC_DATE (R) UTC_TIME (R) UTC_TIMESTAMP (R) VALIDATION[ad] VALUE VALUES (R) VARBINARY (R) VARCHAR (R) VARCHARACTER (R) VARIABLES VARYING (R) VIEW VIRTUAL[ae] (R) WAIT WARNINGS WEEK WEIGHT_STRING WHEN (R) WHERE (R) WHILE (R) WITH (R) WITHOUT[af] WORK WRAPPER WRITE (R) X XA XID[ag] XML XOR (R) YEAR YEAR_MONTH (R) ZEROFILL (R)

[a] ACCOUNT: added in 5.7.6 (nonreserved)

[b] ALWAYS: added in 5.7.6 (nonreserved)

[c] CHANNEL: added in 5.7.6 (nonreserved)

[d] COMPRESSION: added in 5.7.8 (nonreserved)

[e] ENCRYPTION: added in 5.7. (nonreserved)

MySQL 5.7中的关键字与保留字详解(mysql常用关键字及其用法)

[f] FILE_BLOCK_SIZE: added in 5.7.6 (nonreserved)

[g] FILTER: added in 5.7.3 (nonreserved)

[h] FOLLOWS: added in 5.7.2 (nonreserved)

[i] GENERATED: added in 5.7.6 (reserved)

[j] GROUP_REPLICATION: added in 5.7.6 (nonreserved)

[k] INSTANCE: added in 5.7. (nonreserved)

[l] JSON: added in 5.7.8 (nonreserved)

[m] MASTER_TLS_VERSION: added in 5.7. (nonreserved)

[n] MAX_STATEMENT_TIME: added in 5.7.4 (nonreserved); removed in 5.7.8

[o] NEVER: added in 5.7.4 (nonreserved)

[p] NONBLOCKING: removed in 5.7.6

[q] OLD_PASSWORD: removed in 5.7.5

[r] OPTIMIZER_COSTS: added in 5.7.5 (reserved)

[s] PARSE_GCOL_EXPR: added in 5.7.6 (reserved); became nonreserved in 5.7.8

[t] PRECEDES: added in 5.7.2 (nonreserved)

[u] REPLICATE_DO_DB: added in 5.7.3 (nonreserved)

[v] REPLICATE_DO_TABLE: added in 5.7.3 (nonreserved)

[w] REPLICATE_IGNORE_DB: added in 5.7.3 (nonreserved)

[x] REPLICATE_IGNORE_TABLE: added in 5.7.3 (nonreserved)

[y] REPLICATE_REWRITE_DB: added in 5.7.3 (nonreserved)

[z] REPLICATE_WILD_DO_TABLE: added in 5.7.3 (nonreserved)

[aa] REPLICATE_WILD_IGNORE_TABLE: added in 5.7.3 (nonreserved)

[ab] ROTATE: added in 5.7. (nonreserved)

[ac] STORED: added in 5.7.6 (reserved)

[ad] VALIDATION: added in 5.7.5 (nonreserved)

[ae] VIRTUAL: added in 5.7.6 (reserved)

[af] WITHOUT: added in 5.7.5 (nonreserved)

[ag] XID: added in 5.7.5 (nonreserved)

Table .3 Keywords and Reserved Words Added in MySQL 5.7 Compared to MySQL 5.6

ACCOUNT ALWAYS CHANNEL COMPRESSION ENCRYPTION FILE_BLOCK_SIZE FILTER FOLLOWS GENERATED (R) GROUP_REPLICATION INSTANCE JSON MASTER_TLS_VERSION NEVER OPTIMIZER_COSTS (R) PARSE_GCOL_EXPR PRECEDES REPLICATE_DO_DB REPLICATE_DO_TABLE REPLICATE_IGNORE_DB REPLICATE_IGNORE_TABLE REPLICATE_REWRITE_DB REPLICATE_WILD_DO_TABLE REPLICATE_WILD_IGNORE_TABLE ROTATE STACKED STORED (R) VALIDATION VIRTUAL (R) WITHOUT XID

Table .4 Keywords and Reserved Words Removed in MySQL 5.7 Compared to MySQL 5.6

OLD_PASSWORD

总结

标签: mysql常用关键字及其用法

本文链接地址:https://www.jiuchutong.com/biancheng/349899.html 转载请保留说明!

上一篇:mysql 列转行,合并字段的方法(必看)(mysql如何列转行)

下一篇:解说mysql之binlog日志以及利用binlog日志恢复数据的方法(mysqlbinlog -vvv)

  • 税金及附加要计入本年利润吗
  • 娱乐行业缴纳的税收
  • 财务报表是什么意思
  • 红冲发票需要收回原发票政策
  • 金税盘减免政策依据
  • 股票发行的佣金计入什么科目
  • 小规模增值税税率表
  • 固定资产机械设备
  • 劳务派遣简易征收备案
  • 年底没有取得发票企业所得税
  • 企业季度所得税资产总额怎么填
  • 增值税优惠政策有哪些
  • 特定行业如何界定
  • 员工服装属于什么费用类型
  • 季报是根据什么制定的
  • 预收一年租金会计分录
  • 生产车间广告牌设计图片
  • 企业筹建期发生的广告宣传费怎么抵减所得税
  • 残疾人保障金工资总额包括社保吗
  • 建筑行业当月无收入成本如何结转?
  • 新版edge浏览器如何恢复设置
  • 原材料和加工费能分着开票么
  • 计划成本法存货成本的确定
  • 公司为员工购买社保流程
  • 如何部署迫击炮
  • 进程 com surrogate
  • 免征税费需要申报吗
  • 一只草丛里的狐狸作文
  • 股份支付的确认和计量原则
  • 不列颠哥伦比亚大学排名
  • php访问mysql的五个基本步骤
  • 贷款减值是什么会计科目
  • nvidia显卡驱动怎么安装
  • 小规模企业购入固定资产怎么做账务处理
  • vue.js devtools插件下载
  • 出口退税需要提供什么
  • 小规模纳税人年收入超过500万必须转为一般纳税人吗
  • 成本票不够怎么交税
  • 公司5个印章都刻错了
  • sql语句字符串比较大小
  • HTTP/1.1 XCache header field
  • 歌咏比赛服装费用规定标准最新
  • 个税累计预扣法导致税交多了
  • 会影响当期损益的科目有
  • 企业营业税怎么征收
  • 建筑企业预缴的增值税怎么抵扣
  • 哪些增值税专用发票不能抵扣进项税
  • 工会经费和工会会费的区别与联系
  • 资产负债表编制
  • 房产税的纳税义务人是征税范围内房屋产权所有人
  • 电子承兑汇票到期怎么兑现
  • 商场联营扣点缴纳增值税税率
  • 免费样品销售给客户怎么入账
  • 农产品如何进入批发市场
  • 暂估入库成本处理
  • 应收账款是否算负债
  • 为什么windows删除文件很慢
  • mac电脑虚拟机怎么安装
  • win8系统启动不了如何修复
  • mac如何修改用户名称
  • xp如何禁用445
  • win10系统怎么拦截广告弹窗
  • windows 8虚拟机
  • 体验Win8灵活分屏贴靠功能图文介绍
  • win8怎么关闭电脑
  • perl ne
  • 初始化opengl时出错
  • dos批处理实例800例
  • unity简单小游戏案例
  • nodejs orm框架
  • android xml文件有哪几种布局方式
  • html js怎么调用
  • jquery fullpage
  • 四川国税总局官网
  • 上缴财政总额是什么意思
  • 丹东银行总行电话
  • 太原公交车咨询电话号码
  • 粤商通个体户怎样注册
  • 买车购置税去哪里交钱
  • 小区活动宣传文案
  • 免责声明:网站部分图片文字素材来源于网络,如有侵权,请及时告知,我们会第一时间删除,谢谢! 邮箱:opceo@qq.com

    鄂ICP备2023003026号

    网站地图: 企业信息 工商信息 财税知识 网络常识 编程技术

    友情链接: 武汉网站建设