The LIKE operator returns true if the string matches the pattern, and false otherwise. Here are some examples of using the LIKE operator: -- Find all products whose name starts with 'Pen' SELECT * FROM products WHERE name LIKE 'Pen%'; -- Find all customers whose email contains 'gmail' ...
Note that the backslash already has a special meaning in string literals, so to write a pattern constant that contains a backslash you must write two backslashes in an SQL statement. Thus, writing a pattern that actually matches a literal backslash means writing four backslashes in the statement....
:p2, 128); end;' using IN username, OUT canon_username; END IF; IF NOT ora_complexity_check(password, chars => 8, letter => 1, digit => 1, special => 1) THEN RETURN(FALSE); END IF; -- Check if the password contains the username IF regexp_instr(password, canon_username...
As you can see, ltree is a “.”-separated kind of list. You can append values easily. But you have to be careful: You can append to the list if it contains an empty string. If the value is NULL you cannot append. The same is true for other stuff in PostgreSQL as well, and yo...
If a database or table name contains double dollar signs ($$), you cannot create the migration task. When you migrate data from a PostgreSQL database to OceanBase Database Community Edition, OMS Community Edition allows you to import objects from text, rename objects, set row ...
String constant contains a sequence of characters bound by single quotes. This feature is used during insertion of a character or passing character to database objects. PostgreSQL allows the usage of single quotes but embedded by a C style backslash. This feature is important in parsing data.Read...
15. What do you mean by a string constant in PostgreSQL? A string constant is defined as the sequence of characters that are bounded by single quotes i.e., (‘). It can be used during insertion or while passing the characters to the database objects. This is an important feature when...
The data synchronization task fails if the source database contains an empty string of the VARCHAR2 type and the corresponding column in the destination database has a NOT NULL constraint. Empty strings of the VARCHAR2 type are processed as null values in Oracle...
Parameter description: Specifies the name of the file that contains the SSL private key. The relative path is relative to the data directory. This parameter is a POSTMASTER parameter. Set it based on instructions provided in Table 1. Value range: a string Default value: server.key ssl_ca_fil...
The pg_stat_activity view in PostgreSQL provides information about the currently executing activities on the server. It contains a row for each session connected to the database and includes details such as the process ID, username, application name, query being executed, and other useful statistic...