{"id":1470,"date":"2020-10-09T01:18:51","date_gmt":"2020-10-08T18:18:51","guid":{"rendered":"https:\/\/hoctin.vn\/?p=1470"},"modified":"2020-10-09T01:18:52","modified_gmt":"2020-10-08T18:18:52","slug":"ham-lay-ky-tu-bat-ky-trong-excel","status":"publish","type":"post","link":"https:\/\/hoctin.vn\/ham-lay-ky-tu-bat-ky-trong-excel\/","title":{"rendered":"H\u01b0\u1edbng D\u1eabn S\u1eed D\u1ee5ng 3 H\u00e0m L\u1ea5y K\u00fd T\u1ef1 B\u1ea5t K\u1ef3 Trong Excel Hi\u1ec7u Qu\u1ea3 Nh\u1ea5t: H\u00e0m LEFT\/ RIGHT\/ MID"},"content":{"rendered":"\t\t
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Khi x\u1eed l\u00fd v\u0103n b\u1ea3n\/ \u0111\u1ecbnh d\u1ea1ng text trong Excel, ch\u00fang ta th\u01b0\u1eddng ph\u1ea3i x\u1eed l\u00fd ph\u00e2n chia, c\u1eaft chu\u1ed7i v\u0103n b\u1ea3n.<\/span><\/p>

\u00a0<\/span><\/p>

Trong b\u00e0i vi\u1ebft n\u00e0y, hoctin.vn s\u1ebd h\u01b0\u1edbng d\u1eabn c\u00e1c b\u1ea1n c\u00e1ch t\u00e1ch c\u00e1c \u00f4 b\u1eb1ng h\u00e0m c\u1eaft chu\u1ed7i trong Excel: h\u00e0m MID, h\u00e0m LEFT, h\u00e0m RIGHT. <\/span>B\u1ea1n s\u1ebd h\u1ecdc c\u00e1ch s\u1eed d\u1ee5ng c\u00e1c h\u00e0m l\u1ea5y k\u00fd t\u1ef1 b\u1ea5t k\u1ef3 trong Excel \u0111\u1ec3 t\u00e1ch v\u0103n b\u1ea3n, lo\u1ea1i b\u1ecf \u0111\u1ed3ng th\u1eddi gh\u00e9p c\u00e1c chu\u1ed7i k\u00fd t\u1ef1 \u0111\u1ec3 th\u1ecfa m\u00e3n \u0111i\u1ec1u ki\u1ec7n c\u00f4ng vi\u1ec7c y\u00eau c\u1ea7u.<\/span><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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M\u1ee5c L\u1ee5c B\u00e0i Vi\u1ebft<\/h4>\t\t\t\t\t\t\t
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1, H\u00e0m MID - H\u00e0m L\u1ea5y K\u00fd T\u1ef1 B\u1ea5t K\u1ef3 Trong Excel<\/span><\/span><\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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H\u00e0m MID l\u00e0 h\u00e0m l\u1ea5y k\u00fd t\u1ef1 gi\u1eefa trong Excel (Middle):<\/span><\/p>

=MID(text, start_num, num_chars)<\/span><\/p>

Trong \u0111\u00f3:<\/span><\/p>

  • Text: chu\u1ed7i v\u0103n b\u1ea3n c\u1ea7n tr\u00edch xu\u1ea5t.<\/span><\/p><\/li>

  • Start_num: V\u1ecb tr\u00ed c\u1ee7a k\u00fd t\u1ef1 \u0111\u1ea7u ti\u00ean c\u1ea7n t\u00e1ch trong text.<\/span><\/p><\/li>

  • Num_chars: S\u1ed1 k\u00fd t\u1ef1 c\u1ea7n c\u1eaft ra t\u1eeb chu\u1ed7i k\u00fd t\u1ef1.<\/span><\/p><\/li><\/ul>

    \u00a0<\/span><\/p>

    C\u00e1ch s\u1eed d\u1ee5ng h\u00e0m MID \u0111\u1ec3 t\u00e1ch chu\u1ed7i trong Excel v\u00f4 c\u00f9ng \u0111\u01a1n gi\u1ea3n, v\u00ed d\u1ee5 MID(\u201cstudent\u201d,2,4) tr\u1ea3 v\u1ec1 k\u1ebft qu\u1ea3 l\u00e0 \u201ctude\u201d.<\/span><\/p>

    \u00a0<\/span><\/p>

    \u1ee8ng d\u1ee5ng h\u00e0m MID \u0111\u1ec3 t\u00ecm l\u1edbp c\u1ee7a c\u00e1c sinh vi\u00ean trong danh s\u00e1ch sau:<\/span><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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    \n\t\t\t\t\t\t\t\t\t\t\t\t\"V\u00ed\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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    \u0110\u1ec3 s\u1eed d\u1ee5ng h\u00e0m MID tr\u00edch xu\u1ea5t m\u1ed9t s\u1ed1 k\u00fd t\u1ef1 nh\u1ea5t \u0111\u1ecbnh l\u00e0 t\u00ean l\u1edbp (t\u1eeb gi\u1eefa chu\u1ed7i v\u0103n b\u1ea3n):<\/span><\/p>

    MID(C8,3,4) <\/span>tr\u1ea3 v\u1ec1 4 k\u00fd t\u1ef1 \u1edf gi\u1eefa t\u1eeb v\u1ecb tr\u00ed th\u1ee9 3 c\u1ee7a chu\u1ed7i v\u0103n b\u1ea3n n\u1eb1m trong \u00f4 C8, nh\u01b0 v\u00ed d\u1ee5 d\u01b0\u1edbi \u0111\u00e2y, \u00f4 C8 ch\u1ee9a chu\u1ed7i text \u201cCQK17A001@st.edu.vn\u201d n\u00ean k<\/span>\u1ebft qu\u1ea3 c\u1ee7a h\u00e0m MID(C8,3,4) tr\u1ea3 v\u1ec1 \u201cK17A\u201d.<\/span><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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    \n\t\t\t\t\t\t\t\t\t\t\t\t\"v\u00ed\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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    2. H\u00e0m LEFT L\u1ea5y K\u00fd T\u1ef1 B\u00ean Tr\u00e1i Chu\u1ed7i Trong Excel<\/span><\/span><\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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    H\u00e0m LEFT \u0111\u1ec3 l\u1ea5y k\u00fd t\u1ef1 trong chu\u1ed7i t\u1eeb ph\u00eda b\u00ean tr\u00e1i, hay c\u00f2n g\u1ecdi l\u00e0 h\u00e0m x\u00f3a k\u00fd t\u1ef1 b\u00ean ph\u1ea3i trong Excel:<\/span><\/p>

    =LEFT(text, [num_chars])<\/span><\/p>

    Trong \u0111\u00f3:<\/span><\/p>

    • Text: chu\u1ed7i v\u0103n b\u1ea3n c\u1ea7n tr\u00edch xu\u1ea5t c\u00e1c k\u00fd t\u1ef1 t\u1eeb b\u00ean tr\u00e1i, c\u00f3 th\u1ec3 l\u00e0 v\u0103n b\u1ea3n\/ tham chi\u1ebfu \u00f4.<\/span><\/p><\/li>

    • [num_chars]: s\u1ed1 k\u00fd t\u1ef1 c\u1ea7n c\u1eaft chu\u1ed7i, n\u1ebfu kh\u00f4ng \u0111\u01b0\u1ee3c nh\u1eadp s\u1ebd m\u1eb7c \u0111\u1ecbnh b\u1eb1ng 1.<\/span><\/p><\/li><\/ul>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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      V\u00ed d\u1ee5 d\u01b0\u1edbi \u0111\u00e2y c\u1eaft chu\u1ed7i t\u1eeb \u0111\u1ecba ch\u1ec9 email c\u1ee7a sinh vi\u00ean \u0111\u1ec3 ra k\u1ebft qu\u1ea3 l\u00e0 m\u00e3 sinh vi\u00ean t\u01b0\u01a1ng \u1ee9ng khi bi\u1ebft m\u00e3 n\u00e0y l\u00e0 9 k\u00fd t\u1ef1 b\u1eaft \u0111\u1ea7u c\u1ee7a email:<\/span><\/p>

      LEFT(C7,9)<\/b> <\/span>tr\u1ea3 v\u1ec1 9 k\u00fd t\u1ef1 b\u00ean tr\u00e1i chu\u1ed7i n\u1eb1m trong \u00f4 C7<\/span><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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      \n\t\t\t\t\t\t\t\t\t\t\t\t\"v\u00ed\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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      3, H\u00e0m RIGHT T\u00e1ch K\u00fd T\u1ef1 Ph\u00eda B\u00ean Ph\u1ea3i Chu\u1ed7i Trong Excel<\/span><\/span><\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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      H\u00e0m RIGHT \u0111\u1ec3 l\u1ea5y chu\u1ed7i k\u00fd t\u1ef1 trong Excel t\u1eeb ph\u00eda b\u00ean ph\u1ea3i, hay c\u00f2n g\u1ecdi l\u00e0 h\u00e0m b\u1ecf k\u00fd t\u1ef1 b\u00ean tr\u00e1i c\u00f3 c\u00fa ph\u00e1p:<\/span><\/p>

      =RIGHT(text, [num_chars])<\/span><\/p>

      \u00a0<\/span><\/p>

      C\u00e1ch s\u1eed d\u1ee5ng h\u00e0m n\u00e0y y h\u1ec7t h\u00e0m LEFT \u0111\u00e3 tr\u00ecnh b\u00e0y \u1edf tr\u00ean.<\/span><\/p>

      \u00a0<\/span><\/p>

      V\u00ed d\u1ee5 d\u01b0\u1edbi \u0111\u00e2y tr\u00edch xu\u1ea5t s\u1ed1 th\u1ee9 t\u1ef1 c\u1ee7a sinh vi\u00ean trong danh s\u00e1ch l\u1edbp d\u1ef1a v\u00e0o m\u00e3 sinh vi\u00ean \u0111\u00e3 l\u1ea5y \u0111\u01b0\u1ee3c \u1edf m\u1ee5c 2, v\u00ed d\u1ee5 sinh vi\u00ean c\u00f3 m\u00e3 K17ACQ001 s\u1ebd c\u00f3 s\u1ed1 th\u1ee9 t\u1ef1 l\u00e0 001 trong danh s\u00e1ch l\u1edbp K17A, \u0111\u1ec3 l\u1ea5y s\u1ed1 th\u1ee9 t\u1ef1 n\u00e0y, c\u00f4ng th\u1ee9c h\u00e0m RIGHT nh\u01b0 sau:<\/span><\/p>

      RIGHT(\u2018K17ACQ001\u2019,3)<\/b> ho\u1eb7c RIGHT(C7,3)<\/b><\/span><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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      \n\t\t\t\t\t\t\t\t\t\t\t\t\"S\u1eed\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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      4, K\u1ebft H\u1ee3p C\u00e1c H\u00e0m L\u1ecdc K\u00fd T\u1ef1 Trong Excel \u0110\u1ec3 T\u00e1ch\/ Th\u00eam K\u00fd T\u1ef1 V\u00e0o Chu\u1ed7i<\/span><\/span><\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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      \u0110\u1ec3 th\u00eam k\u00fd t\u1ef1 v\u00e0o \u0111\u1ea7u chu\u1ed7i trong Excel, ch\u1ec9 c\u1ea7n s\u1eed d\u1ee5ng d\u1ea5u n\u1ed1i \u0111\u01a1n gi\u1ea3n, v\u00ed d\u1ee5 gh\u00e9p \u201cT\u00e1o\u201d v\u00e0 \u201cApple\u201d s\u1eed d\u1ee5ng = \u201cT\u00e1o\u201d & \u201cApple\u201d s\u1ebd \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 chu\u1ed7i \u201cT\u00e1oApple\u201d.<\/span><\/p>

      \u00a0<\/span><\/p>

      B\u1ea1n c\u00f3 th\u1ec3 th\u00eam v\u00e0o chu\u1ed7i k\u00fd t\u1ef1 d\u1ea5u c\u00e1ch (space) \u201c \u201c \u0111\u1ec3 t\u1ea1o kho\u1ea3ng c\u00e1ch gi\u1eefa c\u00e1c t\u1eeb.<\/span><\/p>

      \u00a0<\/span><\/p>

      V\u00ed d\u1ee5 d\u01b0\u1edbi \u0111\u00e2y t\u00e1ch ph\u1ea7n k\u00fd t\u1ef1 c\u00f3 ch\u1eef c\u00e1i v\u00e0 ph\u1ea7n ch\u1ec9 c\u00f3 s\u1ed1 \u1edf c\u1ee5m bi\u1ec3n s\u1ed1 trong Excel: \u201c30D112345\u201d \u0111\u01b0\u1ee3c t\u00e1ch v\u1ec1 chu\u1ed7i \u201c30D1 – 12345\u201d b\u1eb1ng c\u00e1ch k\u1ebft h\u1ee3p h\u00e0m LEFT v\u00e0 h\u00e0m RIGHT \u0111\u1ec3 t\u00e1ch 2 ph\u1ea7n c\u1ee7a chu\u1ed7i:<\/span><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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      \n\t\t\t\t\t\t\t\t\t\t\t\t\"K\u1ebft\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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      Tuy nhi\u00ean c\u00e1ch n\u00e0y ch\u1ec9 \u00e1p d\u1ee5ng \u0111\u01b0\u1ee3c khi b\u1ed9 s\u1ed1 li\u1ec7u l\u00e0 c\u00e1c chu\u1ed7i c\u00f3 c\u00f9ng \u0111\u1ed9 d\u00e0i, ch\u1ec9 c\u1ea7n m\u1ed9t chu\u1ed7i kh\u00f4ng \u0111\u01b0\u1ee3c nh\u1eadp theo m\u1eabu th\u00ec quy t\u1eafc l\u1ea5y s\u1ed1 k\u00fd t\u1ef1 c\u1ed1 \u0111\u1ecbnh s\u1ebd kh\u00f4ng ch\u00ednh x\u00e1c:<\/span><\/p>

      \u00a0<\/span><\/p>

      V\u00ed d\u1ee5 chu\u1ed7i \u201c30D123456\u201d \u1edf \u00f4 A6 \u0111\u01b0\u1ee3c t\u00e1ch v\u1ec1 chu\u1ed7i \u201c30D1 – 23456\u201d b\u1eb1ng c\u00f4ng th\u1ee9c k\u1ebft h\u1ee3p LEFT(A6,4)&” – “&RIGHT(A6,5) ch\u1ec9 \u0111\u00fang khi bi\u1ec3n s\u1ed1 xe c\u00f3 5 ch\u1eef s\u1ed1.<\/span><\/p>

      \u00a0<\/span><\/p>

      Khi xu\u1ea5t hi\u1ec7n chu\u1ed7i \u201c29B1233.63\u201d c\u00f3 th\u00eam d\u1ea5u ng\u1eaft \u1edf gi\u1eefa th\u00ec k\u1ebft qu\u1ea3 c\u00f4ng th\u1ee9c \u201c29B1 – 33.63\u201d thi\u1ebfu m\u1ea5t 1 ch\u1eef s\u1ed1 c\u1ee7a bi\u1ec3n s\u1ed1, ho\u1eb7c bi\u1ec3n c\u00f3 4 ch\u1eef s\u1ed1 th\u00ec c\u00f4ng th\u1ee9c s\u1ebd l\u1ea5y th\u1eeba 1 ch\u1eef s\u1ed1 v\u00ec h\u00e0m RIGHT(tham chi\u1ebfu \u00f4, 5) l\u1ea5y \u0111\u00fang 5 k\u00fd t\u1ef1 t\u1eeb ph\u1ea3i sang:<\/span><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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      \n\t\t\t\t\t\t\t\t\t\t\t\t\"v\u00ed\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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      \u0110\u1ec3 x\u1eed l\u00fd 1 t\u1ec7p d\u1eef li\u1ec7u g\u1ed3m nhi\u1ec1u chu\u1ed7i v\u0103n b\u1ea3n kh\u00f4ng c\u00f9ng \u0111\u1ed9 d\u00e0i, b\u1ea1n c\u00f3 th\u1ec3 k\u1ebft h\u1ee3p h\u00e0m LEN (tr\u1ea3 v\u1ec1 \u0111\u1ed9 d\u00e0i chu\u1ed7i) c\u00f9ng c\u00e1c h\u00e0m l\u1ea5y k\u00fd t\u1ef1 b\u1ea5t k\u1ef3 trong Excel (h\u00e0m MID\/ RIGHT\/ LEFT):<\/span><\/p>

      \u00a0<\/span><\/p>

      V\u00ed d\u1ee5 chu\u1ed7i \u201c30D123456\u201d v\u00e0 \u201c18F12888\u201d c\u00f3 \u0111\u1ed9 d\u00e0i kh\u00e1c nhau nh\u01b0ng \u0111\u1ec1u c\u00f3 th\u1ec3 t\u00e1ch v\u1ec1 d\u1ea1ng \u201c30D1 – 23456\u201d v\u00e0 \u201c18F1 – 2888\u201d b\u1eb1ng c\u00f4ng th\u1ee9c:<\/span><\/p>

      LEFT(text,4)&” – “&RIGHT(text,LEN(text)-4)<\/span><\/p>

      \u00a0<\/span><\/p>

      Ph\u1ea7n \u0111u\u00f4i c\u1ee7a bi\u1ec3n s\u1ed1 l\u00fac n\u00e0y \u0111\u01b0\u1ee3c t\u00e1ch ra kh\u1ecfi chu\u1ed7i t\u1eeb ph\u00eda b\u00ean ph\u1ea3i, b\u1eb1ng c\u00e1ch k\u1ebft h\u1ee3p h\u00e0m LEN v\u00e0 RIGHT: \u0111\u1ed1i s\u1ed1 <\/span>LEN(text)-4 <\/span>l\u00e0 s\u1ed1 k\u00fd t\u1ef1 \u0111\u01b0\u1ee3c c\u1eaft kh\u1ecfi chu\u1ed7i \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng c\u00e1ch l\u1ea5y \u0111\u1ed9 d\u00e0i c\u1ee7a chu\u1ed7i tr\u1eeb \u0111i 4 k\u00fd t\u1ef1 \u0111\u1ea7u:<\/span><\/p>