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We looked inside some of the posts by salesforce-notes and here's what we found interesting.
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Example: Data Modelling (Hotel Reservation) 创建APP&Tabs
搜索App和Tabs，定制Lightning App
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Example: Data Modelling (Hotel Reservation) 创建Junction Object
Contact和Room关系是Many to many，所以中间有一个Junction Object，这里Reservation就是Junction Object
start date是Date类型
End Date, 比如三天之后
打开Schema Builder即可看到Objects的关系
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Example: Data Modelling (Hotel Reservation) 创建Fields 2
Object Rooms里面建Master detail 和Hotel关联
再建Tariff Field，类型选择Currency
Occupancy Field选择使用Picklist
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Example: Data Modelling (Hotel Reservation) 创建Fields
1. 打开相对应的Objects里面，根据Data Modelling的要求创建Fields
比如Hotel要创建Street Address，field type选择Text
State & City，这需要设置dependent field
先弄State Picklist，选择Picklist Field Type， 再建City Picklist, 设置和上面一样
设置两个Field的dependence，点击Field dependence按钮
New， Controlling Field选择State，因为得先选State才能选择City。Dependent Field依赖Controlling Field的选择。可以Preview查看设置对否
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Example: Data Modelling (Hotel Reservation) 创建Objects
1. 设计Data Modelling，如图
2. 打开Object Manager里的Custom Object，新建Hotel、Room、Reservation objects，contact不用建因为是standard object
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Dependent Picklist
Standard Field = Out of box 系统自带的Field
Controlling Field & Dependent Field
比如你选择澳洲，State变成各种州，选择州可以选择各种城市
Controlling Field 控制 Dependent Field
比如State是Controlling Field，City就是Dependent Field
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Relationships between Lookup & Master detail
Lookup, 像reference连接两个objects，删除互不影响， lookups不支持roll-up summary，sharing和security设置互不影响，每个object最多支持25个lookups
Master detail里，所有都是主从关系，删掉主等于自动删除从，所有设置都是承继关系
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Field Types in Salesforce
Formula Field像excel里面的function，比如sum
Lookup Relationship就像reference
Master-detail relationship直接展示detail
Test(Encrypted) 可以用在保存银行卡信息，比如只展示后几位
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