原创 9. Functions and Operators
Chapter 9. Functions and Operators 第九章.函數和操作符 PostgreSQL provides a large number of functions and operators for the bui
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原创 9.4. String Functions and Operators
9.4. String Functions and Operators 9.4.字符串函數和運算符 This section describes functions and operators for examining and mani
2020-06-29 14:10:57
原创 9.7.1. LIKE
9.7.1. LIKE 9.7.1. LIKE string LIKE pattern [ESCAPE escape-character] string NOT LIKE pattern [ESCAPE escape-charac
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原创 8.16.2. Constructing Composite Values
8.16.2. Constructing Composite Values 8.16.2.構建複合值 To write a composite value as a literal constant, enclose the field
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原创 9.3. Mathematical Functions and Operators
9.3. Mathematical Functions and Operators 9.3.數學函數和運算符 Mathematical operators are provided for many PostgreSQL types. F
2020-06-29 14:10:56
原创 9.6. Bit String Functions and Operators
9.6. Bit String Functions and Operators 9.6.位串函數和操作符 This section describes functions and operators for examining and m
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原创 8.16.6. Composite Type Input and Output Syntax
8.16.6. Composite Type Input and Output Syntax 8.16.6.複合類型的輸入及輸出語法 The external text representation of a composite valu
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原创 8.16. Composite Types
8.16. Composite Types 8.16.複合類型 composite type represents the structure of a row or record; it is essentially just a li
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原创 9.2. Comparison Functions and Operators
9.2. Comparison Functions and Operators 9.2.比較函數和運算符 The usual comparison operators are available, as shown in Table 9.
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原创 8.16.3. Accessing Composite Types
8.16.3. Accessing Composite Types 8.16.3.訪問複合類型 To access a field of a composite column, one writes a dot and the field
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原创 8.16.1. Declaration of Composite Types
8.16.1. Declaration of Composite Types 8.16.1.聲明覆合類型 Here are two simple examples of defining composite types: 以下爲兩個定義複
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原创 8.15.5. Searching in Arrays
8.15.5. Searching in Arrays 8.15.5.檢索數組 To search for a value in an array, each value must be checked. This can be done
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原创 8.15.3. Accessing Arrays
8.15.3. Accessing Arrays 8.15.3.訪問數組 Now, we can run some queries on the table. First, we show how to access a single e
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原创 8.15.6. Array Input and Output Syntax
8.15.6. Array Input and Output Syntax 8.15.6.數組輸入和輸出語法 The external text representation of an array value consists of i
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原创 8.17.2. Examples
8.17.2. Examples 8.17.2.示例 CREATE TABLE reservation (room int, during tsrange); INSERT INTO reservation VALUES (1108,
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