Difference between BYTE and CHAR in column datatypes

Question

In Oracle  what is the difference between    CREATE TABLE CLIENT    NAME VARCHAR2 11 BYTE    ID CLIENT NUMBER     and  CREATE TABLE CLIENT    NAME VARCHAR2 11 CHAR   -- or even VARCHAR2 11   ID CLIENT NUMBER

User · Answer

One has exactly space for 11 bytes  the other for exactly 11 characters  Some charsets such as Unicode variants may use more than one byte per char  therefore the 11 byte field might have space for less than 11 chars depending on the encoding   See also http   www joelonsoftware com articles Unicode html

User · Answer

Let us assume the database character set is UTF-8  which is the recommended setting in recent versions of Oracle  In this case  some characters take more than 1 byte to store in the database   If you define the field as VARCHAR2 11 BYTE   Oracle can use up to 11 bytes for storage  but you may not actually be able to store 11 characters in the field  because some of them take more than one byte to store  e g  non-English characters   By defining the field as VARCHAR2 11 CHAR  you tell Oracle it can use enough space to store 11 characters  no matter how many bytes it takes to store each one  A single character may require up to 4 bytes

User · Answer

Depending on the system configuration  size of CHAR mesured in BYTES can vary  In your examples    Limits field to 11 BYTE Limits field to 11 CHARacters    Conclusion  1 CHAR is not equal to 1 BYTE

User · Answer

One has exactly space for 11 bytes  the other for exactly 11 characters  Some charsets such as Unicode variants may use more than one byte per char  therefore the 11 byte field might have space for less than 11 chars depending on the encoding   See also http   www joelonsoftware com articles Unicode html

User · Answer

One has exactly space for 11 bytes  the other for exactly 11 characters  Some charsets such as Unicode variants may use more than one byte per char  therefore the 11 byte field might have space for less than 11 chars depending on the encoding   See also http   www joelonsoftware com articles Unicode html

User · Answer

Let us assume the database character set is UTF-8  which is the recommended setting in recent versions of Oracle  In this case  some characters take more than 1 byte to store in the database   If you define the field as VARCHAR2 11 BYTE   Oracle can use up to 11 bytes for storage  but you may not actually be able to store 11 characters in the field  because some of them take more than one byte to store  e g  non-English characters   By defining the field as VARCHAR2 11 CHAR  you tell Oracle it can use enough space to store 11 characters  no matter how many bytes it takes to store each one  A single character may require up to 4 bytes

User · Answer

I am not sure since I am not an Oracle user  but I assume that the difference lies when you use multi-byte character sets such as Unicode  UTF-16 32   In this case  11 Bytes could account for less than 11 characters   Also those field types might be treated differently in regard to accented characters or case  for example  binaryField ete       t     will not match while  charField ete       t     might  again not sure about Oracle

User · Answer

I am not sure since I am not an Oracle user  but I assume that the difference lies when you use multi-byte character sets such as Unicode  UTF-16 32   In this case  11 Bytes could account for less than 11 characters   Also those field types might be treated differently in regard to accented characters or case  for example  binaryField ete       t     will not match while  charField ete       t     might  again not sure about Oracle

User · Answer

Depending on the system configuration  size of CHAR mesured in BYTES can vary  In your examples    Limits field to 11 BYTE Limits field to 11 CHARacters    Conclusion  1 CHAR is not equal to 1 BYTE

User · Answer

Let us assume the database character set is UTF-8  which is the recommended setting in recent versions of Oracle  In this case  some characters take more than 1 byte to store in the database   If you define the field as VARCHAR2 11 BYTE   Oracle can use up to 11 bytes for storage  but you may not actually be able to store 11 characters in the field  because some of them take more than one byte to store  e g  non-English characters   By defining the field as VARCHAR2 11 CHAR  you tell Oracle it can use enough space to store 11 characters  no matter how many bytes it takes to store each one  A single character may require up to 4 bytes

User · Answer

I am not sure since I am not an Oracle user  but I assume that the difference lies when you use multi-byte character sets such as Unicode  UTF-16 32   In this case  11 Bytes could account for less than 11 characters   Also those field types might be treated differently in regard to accented characters or case  for example  binaryField ete       t     will not match while  charField ete       t     might  again not sure about Oracle

User · Answer

One has exactly space for 11 bytes  the other for exactly 11 characters  Some charsets such as Unicode variants may use more than one byte per char  therefore the 11 byte field might have space for less than 11 chars depending on the encoding   See also http   www joelonsoftware com articles Unicode html

User · Answer

Let us assume the database character set is UTF-8  which is the recommended setting in recent versions of Oracle  In this case  some characters take more than 1 byte to store in the database   If you define the field as VARCHAR2 11 BYTE   Oracle can use up to 11 bytes for storage  but you may not actually be able to store 11 characters in the field  because some of them take more than one byte to store  e g  non-English characters   By defining the field as VARCHAR2 11 CHAR  you tell Oracle it can use enough space to store 11 characters  no matter how many bytes it takes to store each one  A single character may require up to 4 bytes

User · Answer

Let us assume the database character set is UTF-8  which is the recommended setting in recent versions of Oracle  In this case  some characters take more than 1 byte to store in the database   If you define the field as VARCHAR2 11 BYTE   Oracle can use up to 11 bytes for storage  but you may not actually be able to store 11 characters in the field  because some of them take more than one byte to store  e g  non-English characters   By defining the field as VARCHAR2 11 CHAR  you tell Oracle it can use enough space to store 11 characters  no matter how many bytes it takes to store each one  A single character may require up to 4 bytes

User · Answer

Depending on the system configuration  size of CHAR mesured in BYTES can vary  In your examples    Limits field to 11 BYTE Limits field to 11 CHARacters    Conclusion  1 CHAR is not equal to 1 BYTE

User · Answer

One has exactly space for 11 bytes  the other for exactly 11 characters  Some charsets such as Unicode variants may use more than one byte per char  therefore the 11 byte field might have space for less than 11 chars depending on the encoding   See also http   www joelonsoftware com articles Unicode html

User · Answer

One has exactly space for 11 bytes  the other for exactly 11 characters  Some charsets such as Unicode variants may use more than one byte per char  therefore the 11 byte field might have space for less than 11 chars depending on the encoding   See also http   www joelonsoftware com articles Unicode html

User · Answer

Let us assume the database character set is UTF-8  which is the recommended setting in recent versions of Oracle  In this case  some characters take more than 1 byte to store in the database   If you define the field as VARCHAR2 11 BYTE   Oracle can use up to 11 bytes for storage  but you may not actually be able to store 11 characters in the field  because some of them take more than one byte to store  e g  non-English characters   By defining the field as VARCHAR2 11 CHAR  you tell Oracle it can use enough space to store 11 characters  no matter how many bytes it takes to store each one  A single character may require up to 4 bytes

User · Answer

Depending on the system configuration  size of CHAR mesured in BYTES can vary  In your examples    Limits field to 11 BYTE Limits field to 11 CHARacters    Conclusion  1 CHAR is not equal to 1 BYTE

User · Answer

Depending on the system configuration  size of CHAR mesured in BYTES can vary  In your examples    Limits field to 11 BYTE Limits field to 11 CHARacters    Conclusion  1 CHAR is not equal to 1 BYTE

User · Answer

I am not sure since I am not an Oracle user  but I assume that the difference lies when you use multi-byte character sets such as Unicode  UTF-16 32   In this case  11 Bytes could account for less than 11 characters   Also those field types might be treated differently in regard to accented characters or case  for example  binaryField ete       t     will not match while  charField ete       t     might  again not sure about Oracle

User · Answer

Let us assume the database character set is UTF-8  which is the recommended setting in recent versions of Oracle  In this case  some characters take more than 1 byte to store in the database   If you define the field as VARCHAR2 11 BYTE   Oracle can use up to 11 bytes for storage  but you may not actually be able to store 11 characters in the field  because some of them take more than one byte to store  e g  non-English characters   By defining the field as VARCHAR2 11 CHAR  you tell Oracle it can use enough space to store 11 characters  no matter how many bytes it takes to store each one  A single character may require up to 4 bytes

User · Answer

I am not sure since I am not an Oracle user  but I assume that the difference lies when you use multi-byte character sets such as Unicode  UTF-16 32   In this case  11 Bytes could account for less than 11 characters   Also those field types might be treated differently in regard to accented characters or case  for example  binaryField ete       t     will not match while  charField ete       t     might  again not sure about Oracle

User · Answer

I am not sure since I am not an Oracle user  but I assume that the difference lies when you use multi-byte character sets such as Unicode  UTF-16 32   In this case  11 Bytes could account for less than 11 characters   Also those field types might be treated differently in regard to accented characters or case  for example  binaryField ete       t     will not match while  charField ete       t     might  again not sure about Oracle

User · Answer

Depending on the system configuration  size of CHAR mesured in BYTES can vary  In your examples    Limits field to 11 BYTE Limits field to 11 CHARacters    Conclusion  1 CHAR is not equal to 1 BYTE

User · Answer

Depending on the system configuration  size of CHAR mesured in BYTES can vary  In your examples    Limits field to 11 BYTE Limits field to 11 CHARacters    Conclusion  1 CHAR is not equal to 1 BYTE

User · Answer

Depending on the system configuration  size of CHAR mesured in BYTES can vary  In your examples    Limits field to 11 BYTE Limits field to 11 CHARacters    Conclusion  1 CHAR is not equal to 1 BYTE

User · Answer

One has exactly space for 11 bytes  the other for exactly 11 characters  Some charsets such as Unicode variants may use more than one byte per char  therefore the 11 byte field might have space for less than 11 chars depending on the encoding   See also http   www joelonsoftware com articles Unicode html

User · Answer

One has exactly space for 11 bytes  the other for exactly 11 characters  Some charsets such as Unicode variants may use more than one byte per char  therefore the 11 byte field might have space for less than 11 chars depending on the encoding   See also http   www joelonsoftware com articles Unicode html

User · Answer

I am not sure since I am not an Oracle user  but I assume that the difference lies when you use multi-byte character sets such as Unicode  UTF-16 32   In this case  11 Bytes could account for less than 11 characters   Also those field types might be treated differently in regard to accented characters or case  for example  binaryField ete       t     will not match while  charField ete       t     might  again not sure about Oracle

User · Answer

Let us assume the database character set is UTF-8  which is the recommended setting in recent versions of Oracle  In this case  some characters take more than 1 byte to store in the database   If you define the field as VARCHAR2 11 BYTE   Oracle can use up to 11 bytes for storage  but you may not actually be able to store 11 characters in the field  because some of them take more than one byte to store  e g  non-English characters   By defining the field as VARCHAR2 11 CHAR  you tell Oracle it can use enough space to store 11 characters  no matter how many bytes it takes to store each one  A single character may require up to 4 bytes

User · Answer

I am not sure since I am not an Oracle user  but I assume that the difference lies when you use multi-byte character sets such as Unicode  UTF-16 32   In this case  11 Bytes could account for less than 11 characters   Also those field types might be treated differently in regard to accented characters or case  for example  binaryField ete       t     will not match while  charField ete       t     might  again not sure about Oracle

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