Apache Cassandra static column 介绍与实战 Spark大数据博客 - https://www.iteblog.com Apache Cassandra static column 介绍与实战 假设我们有这样的场景：我们想在 Cassandra 中使用一张表记录用户基本信息（比如 email、密 码等）以及用户状态更新。我们知道，用户的基本信息一般很少会变动，但是状态会经常变化， 间。为了解决这种问题 ，Cassandra 引入了 static column。同一个 partition key 中被声明为 static 的列只有一个值的，也就是只存储一份。 如果想及时了 解Spark、Hadoop或者Hbase相关的文章，欢迎关注微信公共帐号：iteblog_hadoop 定义 static column 在表中将某个列定义为 STATIC 很简单，只需要在列的最后面加上 PRIMARY KEY ("username") 1 / 5 Apache Cassandra static column 介绍与实战 Spark大数据博客 - https://www.iteblog.com ... ); InvalidRequest: Error from

Start the Cassandra Server 1 Login to Cassandra 1 Create a Keyspace (database) 1 Create a Column Family 2 Insert, Update, Delete, Read Data 2 Getting Started with Cassandra and DataStax Community Cassandra Data Model to a Relational Database 45 About Keyspaces 47 Defining Keyspaces 47 About Column Families 48 About Columns 49 About Special Columns (Counter, Expiring, Super) 49 About Expiring About Validators 51 About Comparators 51 About Column Family Compression 52 When to Use Compression 52 Configuring Compression on a Column Family 52 About Indexes in Cassandra 52 About Primary Indexes

......................................................................................32 4.2.1. Column References...................................................................................... ...............52 5.5.1. Adding a Column................................................................................................52 5.5.2. Removing a Column ................................... .....................53 5.5.5. Changing a Column’s Default Value...................................................................54 5.5.6. Changing a Column’s Data Type .............................

......................................................................................30 4.2.1. Column References......................................................................................31 ...................49 5.5.1. Adding a Column.........................................................................................49 5.5.2. Removing a Column ...................................... ........................51 5.5.5. Changing a Column’s Default Value............................................................51 5.5.6. Changing a Column’s Data Type .................................

icability .......................... 1061 37.12. column_column_usage .............................................................. 1062 37.13. column_domain_usage .................................... .......................... 1062 37.14. column_options ........................................................................ 1062 37.15. column_privileges ........................................... ....................... 1063 37.16. column_udt_usage .................................................................... 1064 37.17. columns ..........................................................

icability .......................... 1026 36.12. column_column_usage .............................................................. 1027 36.13. column_domain_usage .................................... .......................... 1027 36.14. column_options ........................................................................ 1027 36.15. column_privileges ........................................... ....................... 1028 36.16. column_udt_usage .................................................................... 1029 36.17. columns ..........................................................

y ................................ 1117 37.12. column_column_usage ................................................................... 1118 37.13. column_domain_usage ................................. ............................... 1118 37.14. column_options ............................................................................. 1119 37.15. column_privileges ................................. ...................................... 1119 37.16. column_udt_usage ......................................................................... 1120 37.17. columns ......................................

Media queries with CSS Variables 19.10. Setting a fallback value for var() 20. Fonts 20.1. font-family 20.2. font-weight 20.3. font-stretch 20.4. font-style 20.5. font-size 20.6. font-variant attribute selectors Every time a rule meets one of those, we increment the value of the second column from the right. Examples: .name { } /* 0 0 1 0 */ .users .name { } /* 0 0 2 0 */ [href$=' properties make more sense to not be inherited. Think about fonts: you don't need to apply the font-family to every single tag of your page. You set the body tag font, and every children inherits it,

y ................................ 1082 36.12. column_column_usage ................................................................... 1083 36.13. column_domain_usage ................................. ............................... 1083 36.14. column_options ............................................................................. 1084 36.15. column_privileges ................................. ...................................... 1084 36.16. column_udt_usage ......................................................................... 1085 36.17. columns ......................................

......................................................................................33 4.2.1. Column References......................................................................................34 ...................61 5.5.1. Adding a Column.........................................................................................62 5.5.2. Removing a Column ...................................... ........................63 5.5.5. Changing a Column’s Default Value............................................................63 5.5.6. Changing a Column’s Data Type .................................