1. 标准数据类型............................3
1.1 BOOL.............................3
1.2 整型数据类型.................3
1.3 REAL / LREAL...............3
1.4 STRING..........................3
1.5 时间、日期类型....................................................................4
1.6 常数.................................................................................4
1.6.1 BOOL – 常数.................................................................4
1.6.2 TIME – 常数.................................................4
1.6.3 DATE – 常数........................................................4
1.6.4 TIME_OF_DAY 常数..............................................4
1.6.5 DATE_AND_TIME – 常数..........................................5
1.6.6 数值常数...............5
1.6.7 REAL / LREAL – 常数..............................5
1.6.8 STRING – 常数..................................5
2. 变量类型转换功能...................6
2.1 BOOL_TO_变换.............6
2.2 TO_BOOL – 变换..............6
2.3 整型数类型之间的转换......................................6
2.4 REAL_TO - / LREAL_TO – 转换...........................................7
2.5 TIME_TO - / TIME_OF_DAY – 转换...................................7
2.6 DATE_TO - / DT_TO – 转换........................7
2.7 STRING_TO – 转换.......7
2.8 TRUNC (取整).................8