Suppose you want to use the dash ( -) character instead of dot (. ORDER BY first_name, last_name Code language: SQL (Structured Query Language) ( sql ) The following statement returns the employee names and their phone numbers. Let’s take a look at the employees table in the sample database. SELECT REPLACE( 'foo foo bar', 'BAR', 'bar') - foo foo bar Code language: SQL (Structured Query Language) ( sql ) SQL REPLACE with the UPDATE statement For example, the following statement returns the original string because it cannot find any occurrences of the substring BAR. If the function cannot find the substring, it does nothing. SELECT REPLACE( 'foo FOO bar', 'foo', 'bar') - bar FOO bar Code language: SQL (Structured Query Language) ( sql ) For example, the following statement replaces foo with bar, the FOO will not be replaced because it does not match the searched string foo. Note that the REPLACE function searches for the substring in the case sensitive manner. SELECT REPLACE( 'foo foo bar', 'foo', 'bar') - bar bar bar Code language: SQL (Structured Query Language) ( sql ) The following statement replaces all the occurrences of bar with foo so the result is bar bar bar. The REPLACE function will search for all occurrences of the old_substring and replace it with the new_string. The following illustrates the syntax of the REPLACE function: REPLACE( string, old_substring, new_substring) Code language: SQL (Structured Query Language) ( sql ) SQL provides a very helpful string function called REPLACE that allows you to replace all occurrences of a substring in a string with a new substring. Sometimes, you want to search and replace a substring with a new one in a column e.g., change a dead link to a new one, rename an obsolete product to the new name, etc. In this tutorial, you have learned how to use the SQL UPPER function to convert a string to uppercase.Summary: in this tutorial, you will learn how to use the SQL REPLACE function to search and replace all occurrences of a substring with another substring in a given string. To overcome this, some database systems provide the function-based index that allows you to define an index based on a function of one or more columns that results in a better query performance. In case the table is big, the query will be very slow. Notice that the query above scans the whole table to find the matching rơ. WHERE UPPER(first_name) = 'BRUCE' Code language: SQL (Structured Query Language) ( sql ) For example, the following query will return a row: SELECT To match data case insensitively, you use the UPER function. SELECTįirst_name = 'BRUCE' Code language: SQL (Structured Query Language) ( sql ) For example, the literal string Bruce is different from bruce. When you query the data using the WHERE clause, the database systems often match data case sensitively. UPDATE employeesĮmail = UPPER(email) Code language: SQL (Structured Query Language) ( sql ) Querying data case insensitive using the UPPER function For example, the following statement updates the emails of employees to uppercase. To convert data to uppercase in the database table, you use the UPDATE statement. The query just read the data from the employees table and convert them on the fly. ORDER BY UPPER(last_name) Code language: SQL (Structured Query Language) ( sql ) The following query uses the UPPER function to convert last names of employees to uppercase. (1 row) Code language: SQL (Structured Query Language) ( sql ) The following statement converts the string sql upper to SQL UPPER: SELECT UPPER( 'sql upper') Code language: SQL (Structured Query Language) ( sql ) UPPER UCASE(string) Code language: SQL (Structured Query Language) ( sql ) SQL UPPER function examples It is “there is more than one way to do it”. If the input string is NULL, the UPPER function returns NULL, otherwise, it returns a new string with all letters converted to uppercase.īesides the UPPER function, some database systems provide you with an additional function named UCASE which is the same as the UPPER function. UPPER(string) Code language: SQL (Structured Query Language) ( sql ) The syntax of the UPPER function is as simple as below. If you want to convert a string to lowercase, you use the LOWER function instead. The SQL UPPER function converts all the letters in a string into uppercase. Summary: this tutorial shows you how to use the SQL UPPER function to convert a string into uppercase.
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