HPL/SQL - Procedural SQL on Hadoop, NoSQL and RDBMS

====== MAX_PART_STRING Function - PL/HQL ====== MAX_PART_STRING function finds the maximum value (last in alphabetical order) for the specified partition column of type STRING (VARCHAR/CHAR). **Syntax**: <code language="sql"> MAX_PART_STRING([db_name.]table_name [, column_name [, part_col=filter, ...]]); </code> **Parameters:** | **Parameter** | **Type** | **Value** | **Description** | | [dbname.]table_name | VARCHAR | Identifier, variable or expression | Table name | | column_name | VARCHAR | Identifier, variable or expression | Partition column name | | part_col=filter | | | Partition filter | **Notes**: * If column name is not specified, the first partition column is used * Partition filter applied before finding the maximum value **Return Value:** * The maximum string for the specified partition * NULL if the table or partition do not exist, or the table is empty **Return Type:** STRING (VARCHAR/CHAR). **Example 1:** Table //db.orders// is partitioned by //country// and has the following partitions: | country=US | | country=UK | | country=DE | Find the maximum value of the partition: <code language="sql"> MAX_PART_STRING(db.orders); </code> Result: US **Example 2:** Table //db.sales// is partitioned by //country// and //local_date// and has the following partitions: | country=US/local_date=2014-12-02 | | country=DE/local_date=2014-12-04 | | country=UK/local_date=2014-12-04 | Find the maximum value for //country// partition column for local_date '2014-12-04': <code language="sql"> MAX_PART_STRING(db.sales, country, local_date='2014-12-04'); </code> Result: UK **Compatibility**: PL/HQL extension. **Version:** PL/HQL 0.01 See also: * [[min-part-string|MIN_PART_STRING(table, colname, partition_spec)]] * [[max-part-int|MAX_PART_INT(table, colname, partition_spec)]] * [[min-part-int|MIN_PART_INT(table, colname, partition_spec)]] * [[max-part-date|MAX_PART_DATE(table, colname, partition_spec)]] * [[min-part-date|MIN_PART_DATE(table, colname, partition_spec)]]