system-tables: add a description for columns#3459
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| * `TABLE_NAME`:具有约束的表的名称。 | ||
| * `COLUMN_NAME`:具有约束的列的名称。 | ||
| * `ORDINAL_POSITION`:列在约束中的位置,而不是列在表中的位置。列位置从 1 开始编号。 | ||
| * `POSITION_IN_UNIQUE_CONSTRAINT`:唯一和主键约束为空。对于外键约束,此列是被引用的表的键的序号位置。 |
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唯一和主键约束为空 是指 唯一约束 和 主键约束 吗?
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cherry pick to release-3.0 in PR #3565 |
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cherry pick to release-4.0 in PR #3567 |
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What is changed, added or deleted? (Required)
Add descriptions of columns in "COLUMNS","ENGINES" and "KEY_COLUMN_USAGE" tables.
Which TiDB version(s) do your changes apply to? (Required)
What is the related PR or file link(s)?