Common usages We are going to go backwards a bit. We will start with demonstrations of PostgreSQL SQL statements that find and replace things and list things out with regular expressions. For these exercises we
(和通常一样,记得在文本常量字串里写双反斜杠。) Some examples: regexp_replace('foobarbaz', 'b..', 'X')fooXbazregexp_replace('foobarbaz', 'b..', 'X', 'g')fooXXregexp_replace('foobarbaz', 'b(..)', 'X\\1Y', 'g')fooXarYXazY PostgreSQL 的正则表达式是使用 Henry Spencer 写的一...
In Postgresql, the regexp_split_to_table() function is used to split the specified string into a table column using the specified POSIX regular expressions. The strings as well as the POSIX regular expression are provided to the function as an argument. This expression will act as a separator...
REGEXP_SPLIT_TO_TABLE(string text, pattern text [, flags text]), splits string using a POSIX regular expression as the delimiter. Following are the examples for all these functions: 复制 testdb=#SELECTREGEXP_MATCHES('ABCDEF','A%C%%');regexp_matches---(0rows)testdb=#SELECTREGEXP_REPLA...
Some examples: 'abc' ~ 'abc'true'abc' ~ '^a'true'abc' ~ '(b|d)'true'abc' ~ '^(b|c)'false The substring function with two parameters, substring(stringfrompattern), provides extraction of a substring that matches a POSIX regular expression pattern. ...
Examples Create an inline primary key constraint with a system-generated constraint name. CREATE TABLE EMPLOYEES ( EMPLOYEE_ID NUMERIC PRIMARY KEY, FIRST_NAME VARCHAR(20), LAST_NAME VARCHAR(25), EMAIL VARCHAR(25)); Create an inline primary key constraint with a user-...
For example, thearray_to_stringfunction converts an array into a string. Then, you can leverage string functions likeSQLLIKE,ILIKE, or even regular expressions to find elements within that array. Now, suppose you want to get all books that have "Suspense" as a genre. Do that with thearra...
Examples Standard to standard: set rds_aurora.limitless_create_table_mode='standard'; CREATE TABLE products( product_no integer PRIMARY KEY, name text, price numeric ); CREATE TABLE orders ( order_id integer PRIMARY KEY, product_no integer REFERENCES products (product_no), quantity integer ); ...
41. What is the operator that is used for case-insensitive regular expression searches in PostgreSQL? 42. What is inverted file in PostgreSQL? 43. What does GEQO stands for in PostgreSQL? 44. How many byte Unique integers does OIDs in PostgreSQL? 45. What is the command that can be used...
Here are some examples: DELETE 1=1 # Apply to all tables and delete all tuples DELETE TABLE_TEST[ID1='001'] # Apply only on table TABLE_TEST DELETE TABLE_TEST[ID1='001' OR ID1='002] DATE_CREATE > '2001-01-01' TABLE_INFO[NAME='test'] The last applies two different delete ...