Sql queries for updating a column

29-Mar-2020 09:17 by 8 Comments

Sql queries for updating a column

The IQ server may return results in any combination of lowercase and uppercase, so you cannot expect case sensitive results in a database that is case insensitive (CASE IGNORE).

In other words, if the join condition causes multiple rows of the table to be updated per row ID, the first row returned becomes the update result.The UPDATE and DELETE statements enable users to modify and delete values already written to Hive.The MERGE statement streamlines UPDATEs, DELETEs, and change data capture operations by drawing on coexisting tables.All four statements support auto-commit, which means that each statement is a separate transaction that is automatically committed after the SQL statement is executed. VALUES, UPDATE, and DELETE statements require the following property values in the configuration file: Administrators must use a transaction manager that supports ACID and the ORC file format to use transactions.See Hive Transactions for information about configuring other properties related to use ACID-based transactions. VALUES statement is revised to support adding multiple values into table columns directly from SQL statements. VALUES statement must provide values for each column in the table.See CREATE TABLE statement for details about updating IDENTITY/AUTOINCREMENT columns, which are another type of DEFAULT column.

VALUES, UPDATE, DELETE, and MERGE SQL statements are supported in Apache Hive 0.14 and later. VALUES statement enables users to write data to Apache Hive from values provided in SQL statements.catid | catgroup | catname | catdesc ------- ---------- ----------- ----------------------------------------- 1 | Sports | MLB | Major League Baseball 2 | Sports | NHL | National Hockey League 3 | Sports | NFL | National Football League 4 | Sports | NBA | National Basketball Association 5 | Sports | MLS | Major League Soccer 6 | Shows | Musicals | Musical theatre 7 | Shows | Plays | All non-musical theatre 8 | Shows | Opera | All opera and light opera 9 | Concerts | Pop | All rock and pop music concerts 10 | Concerts | Jazz | All jazz singers and bands 11 | Concerts | Classical | All symphony, concerto, and choir concerts (11 rows)select * from category where catid between 6 and 8; catid | catgroup | catname | catdesc ------- ---------- ----------- -------------------------------------------- 6 | Theatre | Musicals | Musical theatre 7 | Theatre | Plays | All non-musical theatre 8 | Theatre | Opera | All opera and light opera (3 rows)select * from category where catname='Shows'; catid | catgroup | catname | catdesc ------- ---------- ----------- -------------------------------------------- 6 | Theatre | Shows | 7 | Theatre | Shows | 8 | Theatre | Shows | (3 rows)In this case, the CATDESC column was set to null because no default value was defined when the table was created.Run the following commands to set the CATEGORY table data back to the original values: update category set catdesc='Broadway Musical' where category.catid in (select category.catid from category join event on category.catid = event.catid join venue on venue.venueid = event.venueid join sales on sales.eventid = event.eventid where venuecity='New York City' and catname='Musicals');select * from category order by 1; catid | catgroup | catname | catdesc ------- ---------- ----------- -------------------------------------------- 1 | Sports | MLB | Major League Baseball 2 | Sports | NHL | National Hockey League 3 | Sports | NFL | National Football League 4 | Sports | NBA | National Basketball Association 5 | Sports | MLS | Major League Soccer 6 | Shows | Musicals | Broadway Musical 7 | Shows | Plays | All non-musical theatre 8 | Shows | Opera | All opera and light opera 9 | Concerts | Pop | All rock and pop music concerts 10 | Concerts | Jazz | All jazz singers and bands 11 | Concerts | Classical | All symphony, concerto, and choir concerts (11 rows)update category set catid=100 from event where event.catid=category.catid; select * from category order by 1; catid | catgroup | catname | catdesc ------- ---------- ----------- -------------------------------------------- 1 | Sports | MLB | Major League Baseball 2 | Sports | NHL | National Hockey League 3 | Sports | NFL | National Football League 4 | Sports | NBA | National Basketball Association 5 | Sports | MLS | Major League Soccer 10 | Concerts | Jazz | All jazz singers and bands 11 | Concerts | Classical | All symphony, concerto, and choir concerts 100 | Shows | Opera | All opera and light opera 100 | Shows | Musicals | Musical theatre 100 | Concerts | Pop | All rock and pop music concerts 100 | Shows | Plays | All non-musical theatre (11 rows) Note that the EVENT table is listed in the FROM clause and the join condition to the target table is defined in the WHERE clause. These four rows are the rows whose CATID values were originally 6, 7, 8, and 9; only those four categories are represented in the EVENT table: Update the original 11 rows in the CATEGORY table by extending the previous example and adding another condition to the WHERE clause.For more information about the NUMBER(*) function, see “NULLIF function [Miscellaneous]” in Chapter 4, “SQL Functions” in Reference: Building Blocks, Tables, and Procedures.You can use the ORDER BY clause to control the result from an UPDATE when the FROM clause contains multiple joined tables.If you are not using the NUMBER(*) function, avoid using the ORDER BY clause, because the UPDATE statement performs better without it.

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