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@ -45,7 +45,7 @@ The result type is UInt64.
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## leftPad {#leftpad}
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Pads the current string from the left with a specified string (multiple times, if needed) until the resulting string reaches the given length. Similarly to the MySQL `LPAD` function.
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Pads the current string from the left with spaces or a specified string (multiple times, if needed) until the resulting string reaches the given length. Similarly to the MySQL `LPAD` function.
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**Syntax**
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@ -59,7 +59,6 @@ leftPad('string', 'length'[, 'pad_string'])
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- `length` — The length of the resulting string. [UInt](../data-types/int-uint.md). If the value is less than the input string length, then the input string is returned as-is.
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- `pad_string` — The string to pad the input string with. [String](../data-types/string.md). Optional. If not specified, then the input string is padded with spaces.
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**Returned value(s)**
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- The resulting string of the given length.
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@ -84,7 +83,7 @@ Result:
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## leftPadUTF8 {#leftpadutf8}
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Pads the current string from the left with a specified string (multiple times, if needed) until the resulting string reaches the given length. Similarly to the MySQL `LPAD` function. While in the [leftPad](#leftpad) function the length is measured in bytes, here in the `leftPadUTF8` function it is measured in code points.
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Pads the current string from the left with spaces or a specified string (multiple times, if needed) until the resulting string reaches the given length. Similarly to the MySQL `LPAD` function. While in the [leftPad](#leftpad) function the length is measured in bytes, here in the `leftPadUTF8` function it is measured in code points.
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**Syntax**
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@ -124,23 +123,23 @@ Result:
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## rightPad {#rightpad}
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Pads the current string from the right with a specified string (multiple times, if needed) until the resulting string reaches the given length. Similarly to the MySQL `RPAD` function.
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Pads the current string from the right with spaces or a specified string (multiple times, if needed) until the resulting string reaches the given length. Similarly to the MySQL `RPAD` function.
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**Syntax**
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``` sql
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rightPad('string','length', 'pad_string')
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rightPad('string', 'length'[, 'pad_string'])
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```
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**Arguments**
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- `string` — Input string, that need to be padded. [String](../data-types/string.md).
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- `length` — The length of the resulting string once the input string pads. [UInt](../data-types/int-uint.md). If the value is less than input string length, then string is returned as-is.
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- `pad_string` — The string to pad the current input string with. [String](../data-types/string.md).
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- `string` — Input string, that needs to be padded. [String](../data-types/string.md).
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- `length` — The length of the resulting string. [UInt](../data-types/int-uint.md). If the value is less than the input string length, then the input string is returned as-is.
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- `pad_string` — The string to pad the input string with. [String](../data-types/string.md). Optional. If not specified, then the input string is padded with spaces.
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**Returned value(s)**
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- The resulting string reaches the given length.
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- The resulting string of the given length.
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Type: [String](../data-types/string.md).
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@ -149,36 +148,36 @@ Type: [String](../data-types/string.md).
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Query:
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``` sql
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SELECT rightPad('abc', 7, '*');
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SELECT rightPad('abc', 7, '*'), rightPad('abc', 7);
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```
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Result:
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``` text
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┌─rightPad('abc', 7, '*')─┐
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│ abc**** │
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└─────────────────────────┘
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┌─rightPad('abc', 7, '*')─┬─rightPad('abc', 7)─┐
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│ abc**** │ abc │
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└─────────────────────────┴────────────────────┘
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```
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## rightPadUTF8 {#rightpadutf8}
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Pads the current UTF-8 string from the right with a specified string (multiple times, if needed) until the resulting string reaches the given length. Similarly to the MySQL `RPAD` function.
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Pads the current UTF-8 string from the right with spaces or a specified string (multiple times, if needed) until the resulting string reaches the given length. Similarly to the MySQL `RPAD` function. While in the [rightPad](#rightpad) function the length is measured in bytes, here in the `rightPadUTF8` function it is measured in code points.
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**Syntax**
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``` sql
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rightPadUTF8('string','length', 'pad_string')
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rightPadUTF8('string','length'[, 'pad_string'])
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```
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**Arguments**
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- `string` — Input UTF-8 string, that need to be padded. [String](../data-types/string.md).
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- `length` — The length of the resulting string once the input string pads. [UInt](../data-types/int-uint.md). If the value is less than input string length, then string is returned as-is.
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- `pad_string` — The string to pad the current input string with. [String](../data-types/string.md).
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- `string` — Input UTF-8 string, that needs to be padded. [String](../data-types/string.md).
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- `length` — The length of the resulting string. [UInt](../data-types/int-uint.md). If the value is less than the input string length, then the input string is returned as-is.
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- `pad_string` — The string to pad the input string with. [String](../data-types/string.md). Optional. If not specified, then the input string is padded with spaces.
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**Returned value(s)**
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- The resulting UTF-8 string reaches the given length.
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- The resulting UTF-8 string of the given length.
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Type: [String](../data-types/string.md).
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@ -187,15 +186,15 @@ Type: [String](../data-types/string.md).
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Query:
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``` sql
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SELECT rightPadUTF8('абвг', 7, '*');
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SELECT rightPadUTF8('абвг', 7, '*'), rightPadUTF8('абвг', 7);
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```
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Result:
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``` text
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┌─rightPadUTF8('абвг', 7, '*')─┐
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│ абвг*** │
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└──────────────────────────────┘
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┌─rightPadUTF8('абвг', 7, '*')─┬─rightPadUTF8('абвг', 7)─┐
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│ абвг*** │ абвг │
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└──────────────────────────────┴─────────────────────────┘
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```
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## lower, lcase {#lower}
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@ -1,10 +1,12 @@
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---
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toc_priority: 29
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toc_title: MaterializedMySQL
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toc_title: "[экспериментальный] MaterializedMySQL"
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---
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# MaterializedMySQL {#materialized-mysql}
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# [экспериментальный] MaterializedMySQL {#materialized-mysql}
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**Это экспериментальная функция, которую не следует использовать в продуктивной среде.**
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Создает базу данных ClickHouse со всеми таблицами, существующими в MySQL, и всеми данными в этих таблицах.
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