The result of this query is: part INSTR(email, '.') - INSTR(email, simply calculates the length of the substring. SUBSTR(email, INSTR(email, INSTR(email, '.') - INSTR(email, AS substring You may also want to retrieve a substring that doesn't end at the end of the string but at some specific character, e.g., before '.' Here's how you can do this: Y represents the starting position to obtain the substring (the first character position in the string is always 1). X represents the string you want to obtain a substring from. You do this by subtracting the index from the column length then adding 1: SUBSTR(X, Y, Z) SUBSTR('column name','startposition','endposition') Obtains a substring of the string you’re working with. You can calculate it using the INSTR() and the LENGTH() functions. To find the index of the specific character, you can use the INSTR(column, character) function, where column is the literal string or the column from which you'd like to retrieve the substring, and character is the character at which you'd like to start the substring (here, third argument of the SUBSTR() function is the length of the substring. This time, you're looking for a specific character whose position can vary from row to row. The result is: use the SUBSTR() function just as in the previous examples. SUBSTR(email, INSTR(email, LENGTH(email) - INSTR(email, + 1) AS substring You'd like to display the substring that starts at the sign and ends at the end of the string, but you don't know the exact indexes or lengths. The length of the substring is 5 ( end_index - start_index + 1). This time, the second argument of the function is 2, since we want to start at index 2. The result is: use the SUBSTR() function just as in the previous example. You'd like to display the substring between indexes 2 and 6 (inclusive). >SUBSTR(email, 1, 7) will return the substrings of the values in the email column that start at the first character and go for seven characters. This means the first character has index 1, the second character has index 2, etc. Watch out! Unlike in some other programming languages, the indexes start at 1, not 0. 5 Answers Sorted by: 8 My soluion: sqlite> CREATE TABLE command (cmd TEXT) sqlite> INSERT INTO command (cmd) VALUES ('ls'), ('cd '), (' mpv movie. The third argument is the length of the substring. The second argument is the index of the character at which the substring should begin. From the list of core functions: substr (X,Y,Z) substr (X,Y) substring (X,Y,Z) substring (X,Y) The substr (X,Y,Z) function returns a substring of input string X that begins with the Y-th character and which is Z characters long. The first argument is the string or the column name. 3 Answers Sorted by: 74 Use the substr function. You'd like to display the first seven characters of each email. In the emails table, there is an email column. ltrim(ltrim(substr(tablename.time, 11),'0123456789'),'-') as maintime I have the above trim function which removes the first 11 characters from my string below. You have a column of strings, and you'd like to get substrings from them.
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