[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;...
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 ...
9. Using SECURITY DEFINER SECURITY DEFINER specifies that the procedure is to be executed with the privileges of the user that owns it. A SECURITY DEFINER procedure cannot execute transaction control statements (for example, COMMIT and ROLLBACK, depending on the language). In this example we have...
tg02 before insert on digoal for each row execute procedure debug(); CREATE TRIGGER postgres=# create trigger tg03 after insert on digoal for each row execute procedure debug(); CREATE TRIGGER postgres=# create trigger tg04 after insert on digoal for each statement execute procedure debug(); ...
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 ...
Example: How to Use COALESCE() Function as Equivalent of ISNULL? Firstly, let’s utilize the SELECT statement to see the content of the emp_details table: SELECT * FROM emp_details; From the output, it can be clearly seen that the emp_bonus column contains some null values. We can rep...
They can be fired either at the end of the statement causing the triggering event, or at the end of the containing transaction; in the latter case they are said to be deferred. A pending deferred-trigger firing can also be forced to happen immediately by using SET CONSTRAINTS. Constraint ...
The key word ILIKE can be used instead of LIKE to make the match case-insensitive according to the active locale. This is not in the SQL standard but is a PostgreSQL The operator ~~ is equivalent to LIKE, and ~~* corresponds to ILIKE. There are al...
For example: postgres=# SELECT pg_catalog.lower('Print IN LOWER'); lower --- print in lower (1 row) The upper function, on the other hand, takes a string as an argument and returns a new string with all the characters in uppercase. For example: postgres=# SELECT pg_catalog.upper('...
Example: Column Alias in SELECT Query Copy SELECT first_name AS Name, last_name Surname FROM employee;The following shows the result in pgAdmin.Use double-quotes (") to include space or change the case of the column alias name, as shown below. ...