Let’s get a clear idea of this concept with an example. Suppose, your first result is returned is a null or it contains the data type CHAR, oracle converts that returned value to the VARCHAR2 data type. Oracle considers two nulls as one and the same. If in case the expression is r...
DECODE function in Standard Query Language (SQL) is used to add procedural IF – THEN – ELSE like statements to a query. It compares a given expression with each search value one by one and returns a result on the basis of outcomes received from the comparison. A decode function basically...
For example: SELECT emp_name, Question: Is there a limit to the number of arguments that you can have in one DECODE statement? I’m getting an error, “ORA-00939: too many arguments for function". Answer: Yes, the maximum number of components that you can have in a decode function is...
In this example, the DECODE function evaluates the job_code column, comparing it with the specified search values ('MGR', 'DEV', and 'HR'). If a match is found, the corresponding job title is returned. If there is no match, the function returns 'Unknown'. DECODE...
sql SELECT column, CASE column WHEN 'value1' THEN 'result1' WHEN 'value2' THEN 'result2' ELSE 'default_result' END AS decoded_value FROM table; In this example, you replace the `column`, `'value1'`, `'value2'`, `'result1'`, and `'result2'` with your specific column names an...
Example The DECODE function can be used in Oracle/PLSQL. You could use the DECODE function in a SQL statement as follows: SELECT supplier_name, DECODE(supplier_id, 10000, 'IBM', 10001, 'Microsoft', 10002, 'Hewlett Packard', 'Gateway') result ...
"examples/src/main/java/org/apache/spark/examples/sql/JavaSQLDataSourceExample.java" 3.1.1.手动指定选项 您还可以手动指定将要使用的数据源以及要传递给数据源的任何其他选项。数据源通过其全名指定(org.apache.spark.sql.parquet),但内置的来源,你也可以使用自己的短名称(json,parquet,jdbc,orc,libsvm,csv,...
Set-Location (Encode-SqlName "Table:Test") Decode an identifier To decode a SQL Server identifier from a PowerShell path, use the Decode-Sqlname cmdlet to replace the hexadecimal encodings with the characters the encoding represents. Example (decoding) This example returns "Table:Test":...
Advanced SQL > DECODE Function DECODE is a function in Oracle and is used to provide if-then-else type of logic to SQL. It is not available in MySQL or SQL Server. SyntaxThe syntax for DECODE is: SELECT DECODE ( "column_name", "search_value_1", "result_1", ["search_value_n"...
SQL语言分为: DQL Data Query Language - 数据查询语言; select :从一个或者多个表中检索特定的记录; DML Data Manipulate Language - 数据操作语言; insert :插入记录; update :更新记录; delete :删除记录; DDL Data Define Languge - 数据定义语言; ...