关键字是指在数据库中有意义的字，通常是数据库内部使用， 不能用于命名用户的数据对象。 有的数据库还会详细划分，例如分为关键字，候选字，甚至更详细的分类。分类的标准例如有的是绝对不可以使用，有的通过一定手段例如添加双引号可以使用。

我们为了方便统一称之为关键字，通常用户编写的对象中使用关键字会造成错误或不确定的影响，为了避免这个问题，用户应该避免使用数据库的关键字(含保留字或其他保留别名等)。

这个系列主要整理了各大数据库的关键字，可以用于建库，建表，写存储过程，函数等场景避免冲突。最后会有个脚本工具用来检查是否使用关键字。

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DB2

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CACHE CALL CALLED CAPTURE CARDINALITY CASCADED CASE CAST CCSID CEIL CEILING CHAR CHAR_LENGTH CHARACTER CHARACTER_LENGTH CHECK CLOB CLONE CLOSE CLUSTER COALESCE COLLATE COLLECT COLLECTION COLLID COLUMN COMMENT COMMIT CONCAT CONDITION CONNECT CONNECTION CONSTRAINT CONTAINS CONTINUE CONVERT CORR CORRESPONDING COUNT COUNT_BIG COVAR_POP COVAR_SAMP CREATE CROSS CUBE CUME_DIST CURRENT CURRENT_DATE CURRENT_DEFAULT_TRANSFORM_GROUP CURRENT_LC_CTYPE CURRENT_PATH CURRENT_ROLE CURRENT_SCHEMA CURRENT_SERVER CURRENT_TIME CURRENT_TIMESTAMP CURRENT_TIMEZONE CURRENT_TRANSFORM_GROUP_FOR_TYPE CURRENT_USER CURSOR CYCLE

DATA DATABASE DATAPARTITIONNAME DATAPARTITIONNUM DATE DAY DAYS DB2GENERAL DB2GENRL DB2SQL DBINFO DBPARTITIONNAME DBPARTITIONNUM DEALLOCATE DEC DECIMAL DECLARE DEFAULT DEFAULTS DEFINITION DELETE DENSE_RANK DENSERANK DEREF DESCRIBE DESCRIPTOR DETERMINISTIC DIAGNOSTICS DISABLE DISALLOW DISCONNECT DISTINCT DO DOCUMENT DOUBLE DROP DSSIZE DYNAMIC

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IDENTITY IF IMMEDIATE IMPORT IN INCLUDING INCLUSIVE INCREMENT INDEX INDICATOR INDICATORS INF INFINITY INHERIT INNER INOUT INSENSITIVE INSERT INT INTEGER INTEGRITY INTERSECT INTERSECTION INTERVAL INTO IS ISNULL ISOBID ISOLATION ITERATE

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MAINTAINED MATCH MATERIALIZED MAX MAXVALUE MEMBER MERGE METHOD MICROSECOND MICROSECONDS MIN MINUTE MINUTES MINVALUE MOD MODE MODIFIES MODULE MONTH MONTHS MULTISET

NAN NATIONAL NATURAL NCHAR NCLOB NEW NEW_TABLE NEXTVAL NO NOCACHE NOCYCLE NODENAME NODENUMBER NOMAXVALUE NOMINVALUE NONE NOORDER NORMALIZE NORMALIZED NOT NOTNULL NULL NULLIF NULLS NUMERIC NUMPARTS

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QUERY QUERYNO

RANGE RANK READ READS REAL RECOVERY RECURSIVE REF REFERENCES REFERENCING REFRESH REGR_AVGX REGR_AVGY REGR_COUNT REGR_INTERCEPT REGR_R2 REGR_SLOPE REGR_SXX REGR_SXY REGR_SYY RELEASE RENAME REPEAT RESET RESIGNAL RESTART RESTRICT RESULT RESULT_SET_LOCATOR RETURN RETURNS REVOKE RIGHT ROLE ROLLBACK ROLLUP ROUND_CEILING ROUND_DOWN ROUND_FLOOR ROUND_HALF_DOWN ROUND_HALF_EVEN ROUND_HALF_UP ROUND_UP ROUTINE ROW ROW_NUMBER ROWNUMBER ROWS ROWSET RRN RUN

SAVEPOINT SCHEMA SCOPE SCRATCHPAD SCROLL SEARCH SECOND SECONDS SECQTY SECURITY SELECT SENSITIVE SEQUENCE SESSION SESSION_USER SET SIGNAL SIMILAR SIMPLE SMALLINT SNAN SOME SOURCE SPECIFIC SPECIFICTYPE SQL SQLEXCEPTION SQLID SQLSTATE SQLWARNING SQRT STACKED STANDARD START STARTING STATEMENT STATIC STATMENT STAY STDDEV_POP STDDEV_SAMP STOGROUP STORES STYLE SUBMULTISET SUBSTRING SUM SUMMARY SYMMETRIC SYNONYM SYSFUN SYSIBM SYSPROC SYSTEM SYSTEM_USER

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