Funkcija niza LENGTH Structured Query Language vraća broj znakova zadanog niza ili riječi.

Sintaksa funkcije niza LENGTH

Sintaksa1: Ova sintaksa koristi funkciju LENGTH s nazivom stupca SQL tablice:

 SELECT LENGTH(Column_Name) AS Alias_Name FROM Table_Name; 

U sintaksi moramo navesti naziv tog stupca na kojem želimo izvršiti funkciju niza LENGTH za pronalaženje broja znakova svake vrijednosti.

Sintaksa2: Ova sintaksa koristi funkciju LENGTH s nizom:

 SELECT LENGTH(Original_String); 

Primjeri funkcije niza LENGTH

Primjer 1: Sljedeći SELECT upit prikazuje ukupan broj znakova date JAVATPOINT riječi:

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 SELECT LENGTH( ' JAVATPOINT') AS LENGTH_word; 

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Primjer 2: Sljedeći SELECT upit prikazuje ukupan broj znakova zadanog niza:

 SELECT LENGTH( 'JAVATPOINT is a good website') AS LENGTH_string; 

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Primjer 3: Sljedeći SELECT upit prikazuje duljinu zadane rečenice:

 SELECT LENGTH( 'NEW DELHI IS THE CAPITAL OF INDIA') AS LENGTH_Sentence; 

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Primjer 4: Sljedeći SELECT upit prikazuje duljinu zadanog niza:

 SELECT LENGTH( ' ' ) AS LENGTH_space; 

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Primjer 5: Sljedeći SELECT upit prikazuje duljinu riječi NULL:

 SELECT LENGTH( NULL ) AS Length; 

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Primjer 6: Ovaj primjer koristi funkciju LENGTH s tablicom u Structured Query Language.

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U ovom primjeru izradit ćemo novu SQL tablicu na kojoj želimo izvršiti funkciju LENGTH.

Sintaksa za stvaranje nove tablice u SQL bazi podataka je sljedeća:

 CREATE TABLE table_name ( First_Column_of_table Data Type (character_size of First Column), Second_Column_of_table Data Type (character_size of the Second column ), Third_Column_of_table Data Type (character_size of the Third column), ... Last_Column_of_table Data Type (character_size of the Last column) ); 

Sljedeća naredba CREATE stvara Employee_Grade stol:

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 CREATE TABLE Employee_Grade ( Employee_ID INT PRIMARY KEY, First_Name VARCHAR (100), Last_Name VARCHAR (100), First_City Varchar(120), Second_City Varchar(120), New_City Varchar(120), Attendance_Remarks INT, Work_Remarks INT, Grade Varchar (80) ); 

Donji INSERT upiti umeću zapise zaposlenika s ocjenama i primjedbama u Employee_Grade stol:

 INSERT INTO Employee_Grade (Employee_ID, First_Name, Last_Name, First_City, Second_City, New_City, Attendance_Remarks, Work_Remarks, Grade) VALUES (10, Ramesh, Sharma, Lucknow Aurangabad, Ghaziabad, 88, 95, A2); INSERT INTO Employee_Grade (Employee_ID, First_Name, Last_Name, First_City, Second_City, New_City, Attendance_Remarks, Work_Remarks, Grade) VALUES ( 02, Yadu, Sharma, Aurangabad, Ghaziabad, Noida, 95, 82, A1 ); INSERT INTO Employee_Grade (Employee_ID, First_Name, Last_Name, First_City, Second_City, New_City, Attendance_Remarks, Work_Remarks, Grade) VALUES (07, Vijay, Ramna, Noida, Ghaziabad, Lucknow, 91, 95, A1); INSERT INTO Employee_Grade (Employee_ID, First_Name, Last_Name, First_City, Second_City, New_City, Attendance_Remarks, Work_Remarks, Grade) VALUES (04, Bhanu, Rangopalr, Ghaziabad, Noida, Lucknow, 85, 82, A2); INSERT INTO Employee_Grade (Employee_ID, First_Name, Last_Name, First_City, Second_City, New_City, Attendance_Remarks, Work_Remarks, Grade) VALUES (11, Harry, Roy, Noida, Kanpur, Ghaziabad, 95, 97, A1); INSERT INTO Employee_Grade (Employee_ID, First_Name, Last_Name, First_City, Second_City, New_City, Attendance_Remarks, Work_Remarks, Grade) VALUES (16, Akash, Ramna, Ghaziabad, Meerut, Aurangabad, 95, 90, B1); INSERT INTO Employee_Grade (Employee_ID, First_Name, Last_Name, First_City, Second_City, New_City, Attendance_Remarks, Work_Remarks, Grade) VALUES (19, Ram, Ramna, Lucknow, Ghaziabad, Aurangabad, 89, 95, A2); 

Sljedeća izjava SELECT prikazuje umetnute zapise od gore navedenog Employee_Grade stol:

 SELECT * FROM Employee_Grade; 

Upit 1: Sljedeći SELECT upit koristi funkciju LENGTH sa stupcem First_Name gornje tablice Employee_Grade:

 SELECT First_Name, LENGTH(First_Name) AS LENGTH_FirstName FROM Employee_Grade; 

Ova izjava pokazuje duljinu imena svakog zaposlenika koji radi u industriji.

Upit 2: Sljedeći SELECT upit koristi funkciju LENGTH sa stupcem Last_Name gornje tablice Employee_Grade:

 SELECT Last_Name, LENGTH(Last_Name) AS LENGTH_LastName FROM Employee_Grade; 

Ova izjava pokazuje duljinu prezimena svakog zaposlenika.

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Upit 3: Sljedeći SELECT upit koristi funkciju LENGTH sa stupcima First_City i New_City gornje tablice Employee_Grade:

 SELECT First_City, LENGTH(First_City) AS LENGTH_FirstCity, New_City, LENGTH(New_City) AS LENGTH_NewCity FROM Employee_Grade; 

Ova SQL izjava pokazuje duljinu prvog i novog grada svakog zaposlenika.

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