PostgreSQL CASE WHEN: Conditional Logic in Queries< The CASE WHEN expression in PostgreSQL provides conditional logic within SQL queries. This guide covers syntax, usage examples, and practical applications. What is CASE WHEN in PostgreSQL? The CASE WHEN expression is used to implement conditional log...
SELECT first_name, last_name, CASE department_id WHEN 10 THEN 'Administration' WHEN 20 THEN 20 WHEN 30 THEN 'Purchasing' ELSE 'Others' END AS department_name FROM employees; SQL 错误 [22P02]: ERROR: invalid input syntax for integer: "Others" Position: 183 简单CASE 表达式在进行计算的时候...
OR ） CASE WHEN sex = ‘1’ THEN ‘男’ WHEN sex = ‘2’ THEN ‘女’ ELSE ‘其他’ END...
General PostgreSQL CASE expression The following illustrates the general form of the CASE statement: CASE WHEN condition_1 THEN result_1 WHEN condition_2 THEN result_2 [WHEN ...] [ELSE else_result] END In this syntax, each condition (condition_1, condition_2…) is a boolean expression that...
The below snippet depicts the syntax of a searched CASE statement: CASEWHENcond_1 THEN res_1WHENcond_2 THEN res_2…WHENcond_n THEN res_nELSEelse_resultEND Let’s comprehend the above syntax line-by-line: - The conditions, such as codition_1, condition_2, …, condition_n, are the ...
group byfloor((seqnum-1)/500)havingcount(*)=500)case500>(select*from total_ticks)whentruethen(select*from candles)end;end $$; 我要去接ERROR: syntax error at or near "case"了。我要寻找的是,如果total_ticks中有500行或更多行,那么所需的输出是: ...
CASE selector WHEN selector_value_1 THEN statements_1 WHEN selector_value_1 THEN statement_2 ... ELSE else_statements END CASE; Code language: PostgreSQL SQL dialect and PL/pgSQL (pgsql) Let’s examine the syntax of the simple CASE statement in detail: 1) selector The selector is an...
you’ll get a syntax error: ERROR: relation “person” does not exist LINE 1: SELECT FullName FROM Person This is because PostgreSQL is converting “Person” to “person”, but there is no table called “person”. It is actually called “Person”. ...
Problem When filtering and sorting by string attributes, the case sensitivity will default to the underlying database behavior. Different DB engines have different defaults when it comes to case sensitivity: PostgreSQL indexes are case-s...
Syntax CASE condition WHEN condition value THEN statement ELSE additional statement; Example We can use CASE to evaluate multiple conditions for a single variable, “job_id.” If “job_id” is “ACCOUNT,” the salary increase is 10%; if “job_id” is “IT_PROG,” the...