Example 1: How Does the Searched CASE Statement Work in Postgres? In this example, we will apply the CASE statement on the “author_info” table, whose data is shown in the following snippet: SELECT*FROMauthor_infoORDERBYauthor_idASC; In the following statement, we will use the CASE expre...
Only rows where the department is 'Sales' are included in the result. Example 3: Using CASE WHEN in an UPDATE Statement Code: -- Update employee bonuses based on their performance UPDATE employees SET bonus = CASE WHEN performance_rating = 'Excellent' THEN 1000 WHEN performance_rating = 'Goo...
[ELSEstatements ]ENDCASE; 3.LOOPS of PL/SQL 3.1 LOOP for LOOP, it is often used with EXIT ,CONTINUE ,which is just like "break" and "continue" in C for a loop. the grammar is like below: [ <> ]LOOPstatementsENDLOOP[label]; example is: LOOP-- some computationsEXITWHENcount >100;...
Use the IF-THEN-ELSIF instead of a simple IF-ELSE if you have to evaluate multiple conditions. In such a case, if the specified condition is true, the associated statement within that branch will be executed. If all the specified conditions are evaluated to FALSE, then the control will be...
视图触发器的创建分类 :(INSTEAD OF) (INSERT | UPDATE | DELETE) (FOR EACH ROW) (WHEN NEW.? and,or OLD.? ... other boolean express ...)(before | after) (INSERT | UPDATE | DELETE) (FOR EACH STATEMENT) (WHEN BOOLEAN express except NEW or OLD or columns) 分类...
In this case, you can use the CREATE TABLE AS statement which provides more functionality than the SELECT INTO statement. PostgreSQL SELECT INTO examples We will use the film table from the sample database for the demonstration. 1) Basic PostgreSQL SELECT INTO statement example The following ...
A MOVE statement sets FOUND true if it successfully repositions the cursor, false otherwise. A FOR or FOREACH statement sets FOUND true if it iterates one or more times, else false. FOUND is set this way when the loop exits; inside the execution of the loop, FOUND is not modified by ...
For example, to make a single multistatement transaction commit asynchronously when the default is the opposite, issue SET LOCAL synchronous_commit TO OFF within the transaction. Table 19.1 summarizes the capabilities of the synchronous_commit settings. Table 19.1. synchronous_commit Modes synchronous_...
说明:Return the given string suitably quoted to be used as an identifier in an SQL statement string. Quotes are added only if necessary (i.e., if the string contains non-identifier characters or would be case-folded). Embedded quotes are properly doubled. 对某一字符串加上两引号 ...
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 sal...