数据查询技巧
............\5.1 用SELECT语句创建查询

............\........................\Database.dbc
............\........................\Database.DCT
............\........................\Database.DCX

............\........................\welltools.VCT
............\........................\welltools.vcx
............\........................\员工信息表.CDX
............\........................\员工信息表.dbf
............\........................\员工信息表.FPT
............\........................\第1节实例.SCT
............\........................\第1节实例.scx
............\5.10 利用多个表中的字段创建新表

............\...............................\Database.dbc
............\...............................\Database.DCT
............\...............................\Database.DCX

............\...............................\商品信息表.CDX
............\...............................\商品信息表.dbf
............\...............................\商品信息表.FPT
............\...............................\商品信息表.TBK
............\...............................\库存信息表.CDX
............\...............................\库存信息表.DBF
............\...............................\库存信息表.FPT
............\...............................\第10节实例.SCT
............\...............................\第10节实例.scx
............\5.2 对时间段进行查询

............\....................\Database.dbc
............\....................\Database.DCT
............\....................\Database.DCX

............\....................\welltools.VCT
............\....................\welltools.vcx
............\....................\员工信息表.CDX
............\....................\员工信息表.dbf
............\....................\员工信息表.FPT
............\....................\第2节实例.SCT
............\....................\第2节实例.scx
............\5.3 进行模糊查询

............\................\Database.dbc
............\................\Database.DCT
............\................\Database.DCX

............\................\welltools.VCT
............\................\welltools.vcx
............\................\员工信息表.CDX
............\................\员工信息表.dbf
............\................\员工信息表.FPT
............\................\第3节实例.SCT
............\................\第3节实例.scx
............\5.4 查询控件内内容

............\..................\Database.dbc
............\..................\Database.DCT
............\..................\Database.DCX

............\..................\welltools.VCT
............\..................\welltools.vcx
............\..................\员工信息表.CDX
............\..................\员工信息表.dbf
............\..................\员工信息表.FPT
............\..................\第4节实例.SCT
............\..................\第4节实例.scx
............\5.5 实现查询结果的统计计算

............\..........................\Database.dbc
............\..........................\Database.DCT
............\..........................\Database.DCX

............\..........................\welltools.VCT
............\..........................\welltools.vcx
............\..........................\员工信息表.CDX
............\..........................\员工信息表.dbf
............\..........................\员工信息表.FPT
............\..........................\第5节实例.SCT
............\..........................\第5节实例.scx
............\5.6 对查询结果进行汇总

............\......................\Database.dbc
............\......................\Database.DCT
............\......................\Database.DCX

............\......................\welltools.VCT
............\......................\welltools.vcx
............\......................\员工信息表.CDX
............\......................\员工信息表.dbf
............\......................\员工信息表.FPT
............\......................\第6节实例.SCT
............\......................\第6节实例.scx
............\5.7 将查询结果输出到指定对象

............\............................\Database.dbc
............\............................\Database.DCT
.......