PostgreSQL 10.23 Documentation.............................................................................................. 59 5.4. System Columns .................................................................................. Exclusion Constraints ................................................................................ 67 5.4. System Columns .................................................................................. constraint will automatically create an index of the type specified in the constraint declaration. 5.4. System Columns Every table has several system columns that are implicitly defined by the system.0 码力 | 2727 页 | 11.93 MB | 1 年前3
PostgreSQL 10.23 DocumentationConstraints ........................................................................................... 56 5.4. System Columns .................................................................................. Exclusion Constraints .......................................................................... 63 5.4. System Columns .................................................................................. constraint will automatically create an index of the type specified in the constraint declaration. 5.4. System Columns Every table has several system columns that are implicitly defined by the system.0 码力 | 2590 页 | 12.03 MB | 1 年前3
PostgreSQL 11.22 DocumentationConstraints ........................................................................................... 61 5.4. System Columns .................................................................................. Exclusion Constraints .......................................................................... 69 5.4. System Columns .................................................................................. constraint will automatically create an index of the type specified in the constraint declaration. 5.4. System Columns Every table has several system columns that are implicitly defined by the system.0 码力 | 2732 页 | 12.44 MB | 1 年前3
PostgreSQL 11.22 Documentation.............................................................................................. 65 5.4. System Columns .................................................................................. Exclusion Constraints ................................................................................ 73 5.4. System Columns .................................................................................. constraint will automatically create an index of the type specified in the constraint declaration. 5.4. System Columns Every table has several system columns that are implicitly defined by the system.0 码力 | 2883 页 | 12.34 MB | 1 年前3
PostgreSQL 8.1.11 Documentation..............................................................................................47 5.4. System Columns................................................................................... how null values are matched. These are explained in the reference documentation for CREATE TABLE. 5.4. System Columns Every table has several system columns that are implicitly defined by the system. physical location of the row within its table. (The system columns are further explained in Section 5.4.) 8.13. Pseudo-Types The PostgreSQL type system contains a number of special-purpose entries that0 码力 | 1582 页 | 12.19 MB | 1 年前3
PostgreSQL 8.1 Documentation..............................................................................................47 5.4. System Columns................................................................................... how null values are matched. These are explained in the reference documentation for CREATE TABLE. 5.4. System Columns Every table has several system columns that are implicitly defined by the system. physical location of the row within its table. (The system columns are further explained in Section 5.4.) 8.13. Pseudo-Types The PostgreSQL type system contains a number of special-purpose entries that0 码力 | 1548 页 | 11.54 MB | 1 年前3
PostgreSQL 14.10 DocumentationGenerated Columns ..................................................................................... 64 5.4. Constraints ..................................................................................... Columns ............................................................................................. 64 5.4. Constraints ..................................................................................... generated columns. But conversely, it is not allowed to access generated columns in BEFORE triggers. 5.4. Constraints Data types are a way to limit the kind of data that can be stored in a table. For many0 码力 | 3032 页 | 13.27 MB | 1 年前3
PostgreSQL 14.10 DocumentationGenerated Columns ................................................................................ 60 5.4. Constraints ..................................................................................... Columns ........................................................................................ 60 5.4. Constraints ..................................................................................... generated columns. But conversely, it is not allowed to access generated columns in BEFORE triggers. 5.4. Constraints Data types are a way to limit the kind of data that can be stored in a table. For many0 码力 | 2871 页 | 13.38 MB | 1 年前3
PostgreSQL 13.13 DocumentationGenerated Columns ................................................................................ 60 5.4. Constraints ..................................................................................... Columns ........................................................................................ 60 5.4. Constraints ..................................................................................... generated columns. But conversely, it is not allowed to access generated columns in BEFORE triggers. 5.4. Constraints Data types are a way to limit the kind of data that can be stored in a table. For many0 码力 | 2782 页 | 13.00 MB | 1 年前3
PostgreSQL 13.14 DocumentationGenerated Columns ..................................................................................... 64 5.4. Constraints ..................................................................................... Columns ............................................................................................. 64 5.4. Constraints ..................................................................................... generated columns. But conversely, it is not allowed to access generated columns in BEFORE triggers. 5.4. Constraints Data types are a way to limit the kind of data that can be stored in a table. For many0 码力 | 2940 页 | 12.89 MB | 1 年前3
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