SHOW COLUMNS table_identifier [ database ] 1. 2. 使用示例 -- Create `customer` table in `salesdb` database; USE salesdb; CREATE TABLE customer( cust_cd INT, name VARCHAR(100), cust_addr STRING); 1. 2. 3. 4. 5. 6. --
// To get a list of tables in the current database val tables = spark.catalog.listTables() tables: org.apache.spark.sql.Dataset[org.apache.spark.sql.catalog.Table] = [name: string, database: string ... 3 more fields] 输出: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 display...
Object>minMaxPK=getPkRange(configuration);booleanisStringType=Constant.PK_TYPE_STRING.equals(configuration.getString(Constant.PK_TYPE));booleanisLongType=Constant.PK_TYPE_LONG.equals(configuration.getString(Constant.PK_TYPE));if(isStringType){rangeList=RdbmsRangeSplitWrap.splitAndWrap(String...
// In Scala/Python spark.catalog.listDatabases() spark.catalog.listTables() spark.catalog.listColumns("us_delay_flights_tbl") 从本书的GitHub仓库中导入笔记,然后尝试一下。 2.5 缓存SQL表 尽管我们将在下一章讨论表缓存策略,但是值得一提的是,像DataFrames一样,你可以缓存SQL表和视图和释放SQL表和视图缓...
Spark也有数据库,我们将在本章后面讨论,但现在你应该记住,您还可以看到表在一个特定的数据库通过show tables IN databaseName查询,databaseName代表你想查询的数据库名称,。如果您在一个新的集群或本地模式上运行,则应该返回零结果。 10.7.2. Creating Tables创建表...
In this tutorial, we will see how to list all user HBase tables from the shell and will see syntax, usage, and practice with some examples. Listing All
sql("show tables").show() //释放资源 spark.stop() } } Spark SQL实战 1、数据准备 Spark-sql操作所有的数据均来自Hive,首先在Hive中创建表,并导入数据。一共有3张表:1张用户行为表,1张城市表,1张产品表。 CREATE TABLE `user_visit_action`( `date` string, `user_id` bigint, `session_id` ...
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sqlparser.statement.select.*;importnet.sf.jsqlparser.statement.create.table.CreateTable;importnet.sf.jsqlparser.util.TablesNamesFinder;importorg.apache.commons.lang.StringUtils;importjava.io.Reader;importjava.io.StringReader;importjava.util.ArrayList;importjava.util.HashMap;importjava.util.List;import...
Table 1 describes the SQL statement permission matrix in DLI in terms of permissions on databases, tables, and roles.For privilege granting or revocation on databases and