Decode in SQL This tutorial will help you to learn the use of SQL Decode function so as to add the if-then-else logic to your queries. We shall try to understand the Decode function, its syntax through examples. What is the use of the Decode Function in SQL? As we discussed earlier,...
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...
This pattern is similar to theswitch expressiontypically found in programming languages, or theDECODE functionin other database systems. Let’s illustrate with an example: SELECT [BusinessEntityID],[JobTitle],[BirthDate],[SalariedFlag],IsEmployee=CASE [SalariedFlag] WHEN 1 THEN'Salaried Employee'W...
This example shows the decryption of the string 'Hello' that was encoded with the key 'mykey', returning the original string 'Hello'. 2. Decrypting a Column Value SELECTDECODE(encrypted_name,'securekey')ASdecrypted_nameFROMusers; In this example, the `DECODE` function is used to decrypt th...
The DECODE function offers IF-like capabilities in the nonprocedural SQL environment provided by the Oracle Server. You can use the DECODE syntax to create matrix reports with a fixed number of columns and also perform complex IF-THEN-ELSE logic within a query. The downside to DECODE is that...
encode_decode(expected, compress='blosc') eng = self._create_sql_engine("sqlite:///:memory:") df.to_sql('test', eng, if_exists='append') result = pandas.read_sql_table('test', eng, index_col='index') result.index.names = [None] assert_frame_equal(expected, result) ...
Examples of Substring in SQL Let us now delve into the working functionalities of substrings in SQL. We would look at how substrings could be used in literals, conditional tables, and nested queries. Using Substring on Literals While utilizing the function SUBSTRING() in SQL, we obtain the ...
split(' ', 1) if name == 'CONSTRAINT': yield SQLColumnConstraint() else: if col[0] != '"': raise SQLDecodeError('Column identifier not quoted') name, other = col[1:].split('"', 1) other = other.strip() data_type, constraint_sql = other.split(' ', 1) if data_type not...
Can You Use SQL RPAD with a NULL String? No, RPAD will not work with NULL values. If the expression you’re providing contains a NULL value, or if you’re using a column that may contain a NULL value, you’ll need to use theNVL functionfirst (or a function likeCOALESCEorDECODEto ...
The following is an example of filtering password-related SQL statements. class SelfLoggingConnection(LoggingConnection): def filter(self, msg, curs): if db_settings['password'] in msg.decode(): return b'queries containing the password will not be recorded' return msg conn = psycopg2.connect(...